VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California, the Orbiting Carbon Observatory, or OCO, is displayed after blankets and edge tape were applied. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California, the Orbiting Carbon Observatory, or OCO, is displayed after blankets and edge tape were applied. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in California, the transporter holding NASA's Orbiting Carbon Observatory, or OCO, heads for Launch Complex 576-E. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in California, the transporter holding NASA's Orbiting Carbon Observatory, or OCO, arrives on Launch Complex 576-E. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in California, the transporter holding NASA's Orbiting Carbon Observatory, or OCO, heads for Launch Complex 576-E. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California, workers apply blankets and edge tape to the Orbiting Carbon Observatory, or OCO. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The Orbiting Carbon Observatory, or OCO, spacecraft, shipped from spacecraft facilities in Dulles, Va., by Orbital Sciences, has been moved inside the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The Orbiting Carbon Observatory, or OCO, spacecraft, shipped from spacecraft facilities in Dulles, Va., by Orbital Sciences, arrives at the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The Orbiting Carbon Observatory, or OCO, spacecraft, shipped from spacecraft facilities in Dulles, Va., by Orbital Sciences, is moved into the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California, workers check the Orbiting Carbon Observatory, or OCO. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California, workers remove the wrapping from around the Orbiting Carbon Observatory, or OCO. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California, workers remove the wrapping from around the Orbiting Carbon Observatory, or OCO. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, has been erected atop Orbital Sciences' Taurus XL rocket for a Feb. 24 launch. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, has been erected atop Orbital Sciences' Taurus XL rocket for a Feb. 24 launch. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Just before dawn on Launch Complex 576-E at Vandenberg Air Force Base in California, a crane is attached to the tent covering NASA's Orbiting Carbon Observatory, or OCO, the Taurus XL upper stack and the umbilical tower. The tent will be removed to allow OCO to be raised. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. --Inside the Astrotech payload processing facility at Vandenberg Air Force Base in California, the Orbiting Carbon Observatory, or OCO, is displayed after blankets and edge tape were applied. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility at Vandenberg Air Force Base in California, the Orbiting Carbon Observatory, or OCO, is displayed. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. --Inside the Astrotech payload processing facility at Vandenberg Air Force Base in California, the Orbiting Carbon Observatory, or OCO, is displayed after blankets and edge tape were applied. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. --Inside the Astrotech payload processing facility at Vandenberg Air Force Base in California, the Orbiting Carbon Observatory, or OCO, is displayed after blankets and edge tape were applied. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. --In Space Launch Complex 576-E, Vandenberg Air Force Base in California, Stages 1 and 2 of the Taurus XL launch vehicle are being integrated for NASA's Orbiting Carbon Observatory, called OCO. OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. --In Space Launch Complex 576-E, Vandenberg Air Force Base in California, Stages 1 and 2 of the Taurus XL launch vehicle are being integrated for NASA's Orbiting Carbon Observatory, called OCO. OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. --In Space Launch Complex 576-E, Vandenberg Air Force Base in California, Stages 1 and 2 of the Taurus XL launch vehicle are being integrated for NASA's Orbiting Carbon Observatory, called OCO. OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. --In Space Launch Complex 576-E, Vandenberg Air Force Base in California, Stages 1 and 2 of the Taurus XL launch vehicle are being integrated for NASA's Orbiting Carbon Observatory, called OCO. OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility at Vandenberg Air Force Base in California, the Orbiting Carbon Observatory, or OCO, is displayed. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In the Astrotech payload processing facility at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, is being prepared for transfer to Launch Complex 576-E. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In the Astrotech payload processing facility at Vandenberg Air Force Base in California, workers secure an overhead crane to NASA's Orbiting Carbon Observatory, or OCO. The spacecraft will be moved to a transporter for the trip to Launch Complex 576-E. An umbilical line (left) has been attached. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in California, the transporter holding NASA's Orbiting Carbon Observatory, or OCO, is ready to leave the Astrotech payload processing facility for Launch Complex 576-E. An umbilical line is attached. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In the Astrotech payload processing facility at Vandenberg Air Force Base in California, workers keep watch as a crane lifts and moves NASA's Orbiting Carbon Observatory, or OCO, to a transporter (foreground). OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In the Astrotech payload processing facility at Vandenberg Air Force Base in California, workers help guide NASA's Orbiting Carbon Observatory, or OCO, into place on a transporter. The spacecraft will be moved to Launch Complex 576-E. An umbilical line is attached. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, upper stack is prepared to be raised to vertical. The upper stack, consists of Stages 1, 2 and 3 of Orbital Sciences' Taurus XL rocket as well as the encapsulated OCO spacecraft. Once vertical, the upper stack will be lifted and attached to the Taurus Stage 0, at left. OCO is scheduled for launch aboard the Taurus Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Dan Liberotti, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, the crane, at left, is attached to NASA's Orbiting Carbon Observatory, or OCO, upper stack to lift and attach the spacecraft to Orbital Sciences' Taurus XL rocket's Stage 0 (within the scaffolding). A portion of the umbilical tower (above it) is attached to the upper stack. The upper stack consists of Stages 1, 2 and 3 of the Taurus as well as the encapsulated OCO spacecraft. OCO is scheduled for launch aboard the Taurus Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Dan Liberotti, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, two cranes have raised NASA's Orbiting Carbon Observatory, or OCO, spacecraft to vertical. OCO will be lifted and attached to the waiting Stage 0 motor of the Taurus XL launch vehicle in the tower. The OCO is attached to the upper stack, consisting of Stages 1, 2 and 3 of the Taurus. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, OCO, upper stack is lowered onto the Stage 0 motor of Orbital Sciences' Taurus XL vehicle. The upper stack consists of Stages 1, 2 and 3 of the Taurus, as well as the encapsulated OCO spacecraft. OCO is scheduled for launch the Taurus rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, upper stack is prepared to be raised to vertical. The upper stack, consists of Stages 1, 2 and 3 of Orbital Sciences' Taurus XL rocket as well as the encapsulated OCO spacecraft. Once vertical, the upper stack will be lifted and attached to the Taurus Stage 0, at left. OCO is scheduled for launch aboard the Taurus Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Dan Liberotti, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers prepare NASA's Orbiting Carbon Observatory, or OCO, upper stack for attachment to Orbital Sciences' Taurus XL rocket's Stage 0. The upper stack consists of Stages 1, 2 and 3 of the Taurus as well as the encapsulated OCO spacecraft. Orbital Sciences workers put the non-flight environmental shield over the fairing prior to erection. A portion of the umbilical tower (above it) is attached to the upper stack. OCO is scheduled for launch aboard the Taurus Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Dan Liberotti, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, the crane in the foreground moves the cables used to lower NASA's Orbiting Carbon Observatory, OCO, upper stack onto to the Taurus XL Stage 0 motor behind it. The upper stack consists of Stages 1, 2 and 3 of the Taurus, as well as the encapsulated OCO spacecraft. OCO is scheduled for launch the Taurus rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, the cables from the crane overhead are removed from NASA's Orbiting Carbon Observatory, OCO, upper stack. The upper stack was lowered onto the Stage 0 motor of Orbital Sciences' Taurus XL vehicle. The upper stack consists of Stages 1, 2 and 3 of the Taurus, as well as the encapsulated OCO spacecraft. OCO is scheduled for launch the Taurus rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The Encapsulated Cargo Element (ECE) containing NASA's Orbiting Carbon Observatory, or OCO, is lowered to a horizontal position after arrival at Space Launch Complex 576-E at Vandenberg Air Force Base in California. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. --The Encapsulated Cargo Element (ECE) containing NASA's Orbiting Carbon Observatory, or OCO, is lowered to a horizontal position after arrival at Space Launch Complex 576-E at Vandenberg Air Force Base in California. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- NASA's Orbiting Carbon Observatory, or OCO, arrives at Space Launch Complex 576-E at Vandenberg Air Force Base in California. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The Encapsulated Cargo Element containing NASA's Orbiting Carbon Observatory, or OCO, is lifted from its transporter on Space Launch Complex 576-E at Vandenberg Air Force Base in California. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. --The Encapsulated Cargo Element containing NASA's Orbiting Carbon Observatory, or OCO, lowered to a horizontal position on a transporter, is moved under a protective tent after arrival at Space Launch Complex 576-E at Vandenberg Air Force Base in California. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- NASA's Orbiting Carbon Observatory, or OCO, is transported to Space Launch Complex 576-E at Vandenberg Air Force Base in California. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- NASA's Orbiting Carbon Observatory, or OCO, arrives at Space Launch Complex 576-E at Vandenberg Air Force Base in California. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket, being erected at left, on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California, workers get ready to attach a crane to the shipping container cover over the Orbiting Carbon Observatory, or OCO, spacecraft, delivered from spacecraft facilities in Dulles, Va., by Orbital Sciences. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Trucks roll onto Vandenberg Air Force Base in California to deliver the Orbiting Carbon Observatory, or OCO, spacecraft, shipped from spacecraft facilities in Dulles, Va., by Orbital Sciences, builder of the spacecraft. The observatory will be taken to Astrotech payload processing facility, building 1032. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Inside the Astrotech payload processing facility, building 1032, at Vandenberg Air Force Base in California, workers remove the shipping container cover over the Orbiting Carbon Observatory, or OCO, spacecraft, delivered from spacecraft facilities in Dulles, Va., by Orbital Sciences. After the protective coverings over the spacecraft are removed, blanket preparations and edge taping will be done, followed by mechanical preparations and work on the electronic ground support equipment. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Jan. 15 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Space Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, spacecraft displays the mission decals. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Space Launch Complex 576-E at Vandenberg Air Force Base in California, a worker applies a mission decal to NASA's Orbiting Carbon Observatory, or OCO. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers remove the umbilical tower attached to Orbital Sciences' Taurus XL rocket. Atop the rocket is NASA's Orbiting Carbon Observatory, or OCO, which is scheduled to launch Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, upper stack is prepared to be raised to vertical. The upper stack, consists of stages 1, 2 and 3 of the Taurus. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers remove the umbilical tower attached to Orbital Sciences' Taurus XL rocket. Atop the rocket is NASA's Orbiting Carbon Observatory, or OCO, which is scheduled to launch Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers remove the umbilical tower attached to Orbital Sciences' Taurus XL rocket. Atop the rocket is NASA's Orbiting Carbon Observatory, or OCO, which is scheduled to launch Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers in the bucket trucks are securing the fairing ducting, GN2 purge line, and cable harnesses to the umbilical mast attached to Orbital Sciences' Taurus XL rocket. Atop the rocket is NASA's Orbiting Carbon Observatory, or OCO, which is scheduled to launch Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Space Launch Complex 576-E at Vandenberg Air Force Base in California, a worker applies a mission decal onto NASA's Orbiting Carbon Observatory, or OCO. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, OCO, upper stack is lowered toward the Stage 0 motor of the Taurus XL vehicle. The upper stack consists of Stages 1, 2 and 3 of the Taurus. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Space Launch Complex 576-E at Vandenberg Air Force Base in California, a worker applies a mission decal to NASA's Orbiting Carbon Observatory, or OCO, spacecraft. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, two cranes raise NASA's Orbiting Carbon Observatory, or OCO, spacecraft to vertical for attachment to the waiting Stage 0 motor of the Taurus XL launch vehicle in the tower. The OCO is attached to the upper stack, consisting of Stages 1, 2 and 3 of the Taurus. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, two cranes are used to lift NASA's Orbiting Carbon Observatory, or OCO, spacecraft. It will be raised to vertical and attached to the waiting Stage 0 motor of the Taurus XL launch vehicle in the tower. The OCO is attached to the upper stack, consisting of Stages 1, 2 and 3 of the Taurus. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Just before dawn on Launch Complex 576-E at Vandenberg Air Force Base in California, a crane lifts the tent covering (at left) NASA's Orbiting Carbon Observatory, or OCO, the Taurus XL upper stack and the umbilical tower. The tent removal will allow OCO to be raised. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, two cranes raise NASA's Orbiting Carbon Observatory, or OCO, spacecraft to vertical for attachment to the waiting Stage 0 motor of the Taurus XL launch vehicle in the tower. The OCO is attached to the upper stack, consisting of Stages 1, 2 and 3 of the Taurus. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, OCO, upper stack is lowered onto the Stage 0 motor of the Taurus XL vehicle. The upper stack consists of Stages 1, 2 and 3 of the Taurus, as well as the encapsulated OCO spacecraft. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, Orbital Sciences Engineer Jose Castillo (right) maneuvers the bucket truck into position over the fairing access door on NASA's Orbiting Carbon Observatory, or OCO. Technician Mark Neuse feels for the payload access door through the environmental cover. OCO is scheduled for launch the Taurus rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Space Launch Complex 576-E, Vandenberg Air Force Base in California, a worker checks the integration of the Taurus XL Stages 1 and 2. The Taurus is the launch vehicle for NASA's Orbiting Carbon Observatory, called OCO, a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Space Launch Complex 576-E, Vandenberg Air Force Base in California, a worker checks the integration of the Taurus XL Stages 1 and 2. The Taurus is the launch vehicle for NASA's Orbiting Carbon Observatory, called OCO, a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is targeted to launch Feb. 23 from Space Launch Complex 576-E at Vandenberg. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Stage 0 of the Taurus XL launch vehicle for the Orbiting Carbon Observatory arrives at complex 576E at Vandenberg Air Force Base in California. It will be mated with stages 1, 2 and 3 for the launch of OCO. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. It is scheduled to launch Feb. 23. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Stage 0 of the Taurus XL launch vehicle for the Orbiting Carbon Observatory arrives at complex 576E at Vandenberg Air Force Base in California. It will be mated with stages 1, 2 and 3 for the launch of OCO. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. It is scheduled to launch Feb. 23. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The avionics are mated to stage 2 of the Taurus XL launch vehicle for the Orbiting Carbon Observatory at Vandenberg Air Force Base in California. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The launch of OCO is scheduled for Feb. 23. Photo credit: NASA/VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The Stage 1, 2 and 3 motors of the Taurus XL rocket are being prepared for transfer to Space Launch Complex 576-E at Vandenberg Air Force Base in California. The Taurus is the launch vehicle for NASA's Orbiting Carbon Observatory, or OCO, which is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is scheduled to launch Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The first half of the fairing is placed around NASA's Orbiting Carbon Observatory, or OCO, at Vandenberg Air Force Base in California. The fairing is a molded structure that fits flush with the outside surface of the rocket and forms an aerodynamically smooth nose cone, protecting the spacecraft during launch and ascent. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The second half of the fairing, at right, is moved closer to NASA's Orbiting Carbon Observatory, or OCO, at left, to complete installation. The work is being done in Building 1032 of Vandenberg Air Force Base in California. The fairing is a molded structure that fits flush with the outside surface of the rocket and forms an aerodynamically smooth nose cone, protecting the spacecraft during launch and ascent. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Workers secure the installation of the fairing around NASA's Orbiting Carbon Observatory, or OCO. The work is being done in Building 1032 of Vandenberg Air Force Base in California. The fairing is a molded structure that fits flush with the outside surface of the rocket and forms an aerodynamically smooth nose cone, protecting the spacecraft during launch and ascent. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers prepare NASA's Orbiting Carbon Observatory, or OCO, upper stack for attachment to the Stage 0. Orbital Sciences workers put the non-flight environmental shield over the fairing prior to erection. A portion of the umbilical tower (above it) is attached to the upper stack. The umbilical tower will be erected along with the upper stack. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The Stage 1, 2 and 3 motors of the Taurus XL rocket are being prepared for transfer to Space Launch Complex 576-E at Vandenberg Air Force Base in California. The Taurus is the launch vehicle for NASA's Orbiting Carbon Observatory, or OCO, which is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is scheduled to launch Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- At left, the second half of the fairing is moved toward NASA's Orbiting Carbon Observatory, or OCO, at right, for installation. The work is being done in Building 1032 of Vandenberg Air Force Base in California. The fairing is a molded structure that fits flush with the outside surface of the rocket and forms an aerodynamically smooth nose cone, protecting the spacecraft during launch and ascent. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, OCO, upper stack is lifted high for transfer to the waiting Stage 0 motor of the Taurus XL vehicle at left. The upper stack consists of Stages 1, 2 and 3 of the Taurus. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, cranes wait in the early morning hours for winds to subside in order to lift the tent that covers NASA's Orbiting Carbon Observatory, or OCO, the Taurus XL upper stack and the umbilical tower. The upper stack, consists of stages 1, 2 and 3 of the Taurus. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- Workers check the movement of the fairing at right toward NASA's Orbiting Carbon Observatory, or OCO, at left, to complete installation. The work is being done in Building 1032 of Vandenberg Air Force Base in California. The fairing is a molded structure that fits flush with the outside surface of the rocket and forms an aerodynamically smooth nose cone, protecting the spacecraft during launch and ascent. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The Stage 1, 2 and 3 motors of the Taurus XL rocket are being prepared for transfer to Space Launch Complex 576-E at Vandenberg Air Force Base in California. The Taurus is the launch vehicle for NASA's Orbiting Carbon Observatory, or OCO, which is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The observatory is scheduled to launch Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- The second half of the fairing is prepared for installation around NASA's Orbiting Carbon Observatory, or OCO, at Vandenberg Air Force Base in California. The fairing is a molded structure that fits flush with the outside surface of the rocket and forms an aerodynamically smooth nose cone, protecting the spacecraft during launch and ascent. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket on Feb. 23 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. Photo credit: NASA/Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Space Launch Complex 576-E at Vandenberg Air Force Base in California, cranes are in position to move the tent where the upper stage of Orbital Sciences' Taurus XL rocket is ready to be moved and lifted into the tower for stacking. The spacecraft is scheduled for launch aboard Orbital Sciences' Taurus XL rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- At complex 576E at Vandenberg Air Force Base in California, a crane lifts Stage 0 of the Taurus XL launch vehicle for the Orbiting Carbon Observatory from its transporter. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. It is scheduled to launch Feb. 23. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- At complex 576E at Vandenberg Air Force Base in California, a crane raises Stage 0 of the Taurus XL launch vehicle for the Orbiting Carbon Observatory from its transporter. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. It is scheduled to launch Feb. 23. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- At complex 576E at Vandenberg Air Force Base in California, a crane lifts Stage 0 of the Taurus XL launch vehicle for the Orbiting Carbon Observatory from its transporter. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. It is scheduled to launch Feb. 23. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- At complex 576E at Vandenberg Air Force Base in California, a crane lifts Stage 0 of the Taurus XL launch vehicle for the Orbiting Carbon Observatory from its transporter. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. It is scheduled to launch Feb. 23. Photo credit: NASA/Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, undergoes closeouts for launch. OCO is atop the Orbital Sciences' Taurus XL rocket. OCO is scheduled for launch on the Taurus rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, undergoes closeouts for launch. OCO is atop the Orbital Sciences' Taurus XL rocket. OCO is scheduled for launch on the Taurus rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, undergoes closeouts for launch. OCO is atop the Orbital Sciences' Taurus XL rocket. OCO is scheduled for launch on the Taurus rocket Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- With the fairing door off, Orbital Science's Jose Castillo and Mark Neuse remove the fairing payload access door on NASA's Orbiting Carbon Observatory, or OCO, spacecraft on Launch Complex 576-E at Vandenberg Air Force Base in California. Orbital Science's Glenn Weigle and Brett Gladish stand by to take the GN2 flow reading The encapsulated OCO tops Orbital Sciences' Taurus XL rocket, which is scheduled to launch Feb. 24. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo courtesy of Glenn Weigle, Orbital Sciences

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, spacecraft waits atop Orbital Sciences' Taurus XL rocket to launch Feb. 24. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo courtesy of Glenn Weigle, Orbital Sciences

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, spacecraft awaits a GN2 instrument purge flow test in preparation for launch Feb. 24. The spacecraft sits atop Orbital Sciences' Taurus XL rocket. At right is a portion of the umbilical tower attached to the upper stack. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo courtesy of Jim Stowers, Orbital Sciences

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, Orbital Science's Jose Castillo and Mark Neuse (right) move in to remove the fairing payload access door on NASA's Orbiting Carbon Observatory, or OCO, spacecraft. Orbital Science's Glenn Weigle and Brett Gladish are nearby (shadows on the fairing) to take the GN2 flow reading. The encapsulated OCO tops Orbital Sciences' Taurus XL rocket, which is scheduled to launch Feb. 24. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo courtesy of Glenn Weigle, Orbital Sciences

VANDENBERG AIR FORCE BASE, Calif. – Workers push the second stage for NASA's Orbiting Carbon Observatory-2 mission, or OCO-2, toward the Horizontal Processing Facility at Space Launch Complex 2 on Vandenberg Air Force Base in California. OCO-2 is scheduled to launch aboard a United Launch Alliance Delta II rocket in July. The rocket's second stage will insert OCO-2 into a polar Earth orbit. OCO-2 will collect precise global measurements of carbon dioxide in the Earth's atmosphere and provide scientists with a better idea of the chemical compound's impacts on climate change. Scientists will analyze this data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important atmospheric gas. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/Arron Tauman, 30th Space Wing, VAFB

VANDENBERG AIR FORCE BASE, Calif. – Workers prepare to remove the cover of the transportation trailer protecting the second stage for NASA's Orbiting Carbon Observatory-2 mission, or OCO-2, in the high bay of the Building 836 hangar on Vandenberg Air Force Base in California. OCO-2 is scheduled to launch aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 in July. The rocket's second stage will insert OCO-2 into a polar Earth orbit. OCO-2 will collect precise global measurements of carbon dioxide in the Earth's atmosphere and provide scientists with a better idea of the chemical compound's impacts on climate change. Scientists will analyze this data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important atmospheric gas. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/Arron Tauman, 30th Space Wing, VAFB

Vandenberg Air Force Base, Calif. – In the Astrotech Payload Processing Facility at Vandenberg Air Force Base in California, preparations are under way to fuel NASA's Orbiting Carbon Observatory, or OCO, with hydrazine thruster control propellant. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The OCO mission will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. The launch of OCO is scheduled for Feb. 23 from Vandenberg. Photo credit: Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. – Workers guide the second stage for NASA's Orbiting Carbon Observatory-2 mission, or OCO-2, into the Horizontal Processing Facility at Space Launch Complex 2 on Vandenberg Air Force Base in California. OCO-2 is scheduled to launch aboard a United Launch Alliance Delta II rocket in July. The rocket's second stage will insert OCO-2 into a polar Earth orbit. OCO-2 will collect precise global measurements of carbon dioxide in the Earth's atmosphere and provide scientists with a better idea of the chemical compound's impacts on climate change. Scientists will analyze this data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important atmospheric gas. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/Arron Tauman, 30th Space Wing, VAFB

Vandenberg Air Force Base, Calif. – In the Astrotech Payload Processing Facility at Vandenberg Air Force Base in California, a technician monitors data during fueling of NASA's Orbiting Carbon Observatory, or OCO, with hydrazine thruster control propellant. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. The OCO mission will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. This improved understanding will enable more reliable forecasts of future changes in the abundance and distribution of CO2 in the atmosphere and the effect that these changes may have on the Earth's climate. The launch of OCO is scheduled for Feb. 23 from Vandenberg. Photo credit: Robert Hargreaves Jr., VAFB

VANDENBERG AIR FORCE BASE, Calif. – The second stage for NASA's Orbiting Carbon Observatory-2 mission, or OCO-2, is being towed from the Building 836 hangar to the Horizontal Processing Facility at Space Launch Complex 2 on Vandenberg Air Force Base in California. OCO-2 is scheduled to launch aboard a United Launch Alliance Delta II rocket in July. The rocket's second stage will insert OCO-2 into a polar Earth orbit. OCO-2 will collect precise global measurements of carbon dioxide in the Earth's atmosphere and provide scientists with a better idea of the chemical compound's impacts on climate change. Scientists will analyze this data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important atmospheric gas. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/Arron Tauman, 30th Space Wing, VAFB

VANDENBERG AIR FORCE BASE, Calif. – As the cover of the transportation trailer is lifted in the high bay of the Building 836 hangar on Vandenberg Air Force Base in California, the second stage for NASA's Orbiting Carbon Observatory-2 mission, or OCO-2, comes into view. OCO-2 is scheduled to launch aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 in July. The rocket's second stage will insert OCO-2 into a polar Earth orbit. OCO-2 will collect precise global measurements of carbon dioxide in the Earth's atmosphere and provide scientists with a better idea of the chemical compound's impacts on climate change. Scientists will analyze this data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important atmospheric gas. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/Arron Tauman, 30th Space Wing, VAFB

VANDENBERG AIR FORCE BASE, Calif. – As the cover of the transportation trailer is lifted in the high bay of the Building 836 hangar on Vandenberg Air Force Base in California, the second stage for NASA's Orbiting Carbon Observatory-2 mission, or OCO-2, comes into view. OCO-2 is scheduled to launch aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 in July. The rocket's second stage will insert OCO-2 into a polar Earth orbit. OCO-2 will collect precise global measurements of carbon dioxide in the Earth's atmosphere and provide scientists with a better idea of the chemical compound's impacts on climate change. Scientists will analyze this data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important atmospheric gas. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/Arron Tauman, 30th Space Wing, VAFB