
Backdropped by a twilight sky, Northrop Grumman's L-1011 Stargazer undergoes final preparations prior to its takeoff from Vandenberg Air Force Base in California on Oct. 1, 2019. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer is targeted to launch on Oct. 9, 2019, from Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above.

Northrop Grumman's L-1011 Stargazer takes off from Vandenberg Air Force Base in California on Oct. 1, 2019. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer is targeted to launch on Oct. 9, 2019, from Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above.

Northrop Grumman's L-1011 Stargazer takes off from Vandenberg Air Force Base in California on Oct. 1, 2019. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer is targeted to launch on Oct. 9, 2019, from Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above.

Northrop Grumman's L-1011 Stargazer takes off from Vandenberg Air Force Base in California on Oct. 1, 2019. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer is targeted to launch on Oct. 9, 2019, from Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above.

Northrop Grumman's L-1011 Stargazer awaits takeoff from Vandenberg Air Force Base in California on Oct. 1, 2019. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer is targeted to launch on Oct. 9, 2019, from Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above.

Northrop Grumman's L-1011 Stargazer takes off from Vandenberg Air Force Base in California on Oct. 1, 2019. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer is targeted to launch on Oct. 9, 2019, from Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above.

Northrop Grumman's L-1011 Stargazer is undergoing final preparations prior to its takeoff from Vandenberg Air Force Base in California on Oct. 1, 2019. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer is targeted to launch on Oct. 9, 2019, from Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above.

The Northrop Grumman Pegasus XL rocket, with NASA's Ionospheric Connection Explorer (ICON) secured in its payload fairing, begins rollout from Building 1555 at Vandenberg Air Force Base in California on Sept. 25, 2019. The Pegasus XL rocket will be attached beneath the company's L-1011 Stargazer aircraft for the flight to Cape Canaveral Air Force Station (CCAFS) in Florida. ICON will launch from the Skid Strip at CCAFS. Launch is scheduled for Oct. 10, 2019. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

The Northrop Grumman Pegasus XL rocket, with NASA's Ionospheric Connection Explorer (ICON) secured in its payload fairing, rolls out to the runway at Vandenberg Air Force Base in California on Sept. 25, 2019. The Pegasus XL rocket will be attached beneath the company's L-1011 Stargazer aircraft for the flight to Cape Canaveral Air Force Station (CCAFS) in Florida. ICON will launch from the Skid Strip at CCAFS. Launch is scheduled for Oct. 10, 2019. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

The Northrop Grumman Pegasus XL rocket, with NASA's Ionospheric Connection Explorer (ICON) secured in its payload fairing, begins rollout from Building 1555 at Vandenberg Air Force Base in California on Sept. 25, 2019. The Pegasus XL rocket will be attached beneath the company's L-1011 Stargazer aircraft for the flight to Cape Canaveral Air Force Station (CCAFS) in Florida. ICON will launch from the Skid Strip at CCAFS. Launch is scheduled for Oct. 10, 2019. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

The Northrop Grumman Pegasus XL rocket, with NASA's Ionospheric Connection Explorer (ICON) secured in its payload fairing, rolls out to the runway at Vandenberg Air Force Base in California on Sept. 25, 2019. The Pegasus XL rocket will be attached beneath the company's L-1011 Stargazer aircraft for the flight to Cape Canaveral Air Force Station (CCAFS) in Florida. ICON will launch from the Skid Strip at CCAFS. Launch is scheduled for Oct. 10, 2019. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

The Northrop Grumman Pegasus XL rocket, with NASA's Ionospheric Connection Explorer (ICON) secured in its payload fairing, rolls out from Building 1555 to the runway at Vandenberg Air Force Base in California on Sept. 25, 2019. The Pegasus XL rocket will be attached beneath the company's L-1011 Stargazer aircraft for the flight to Cape Canaveral Air Force Station (CCAFS) in Florida. ICON will launch from the Skid Strip at CCAFS in Florida. Launch is scheduled for Oct. 10, 2019. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

Northrop Grumman's L-1011 Stargazer takes off from Vandenberg Air Force Base in California on Oct. 1, 2019. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer is targeted to launch on Oct. 9, 2019, from Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above.

Northrop Grumman's L-1011 Stargazer takes off from Vandenberg Air Force Base in California on Oct. 1, 2019. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer is targeted to launch on Oct. 9, 2019, from Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above.

Northrop Grumman's L-1011 Stargazer soars upward after takeoff from the hot pad at Vandenberg Air Force Base in California on Oct. 19, 2018. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The Pegasus XL rocket will launch from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

Northrop Grumman's L-1011 Stargazer is being readied for takeoff Oct. 19, 2018, from the hot pad at Vandenberg Air Force Base in California. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The Pegasus XL rocket will launch from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

Northrop Grumman's L-1011 Stargazer prepares for takeoff June 6, 2018, from the hot pad at Vandenberg Air Force Base in California. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer will launch on June 15, 2018, from Kwajalein Atoll in the Marshall Islands (June 14 in the continental United States). ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

Northrop Grumman's L-1011 Stargazer prepares for takeoff June 6, 2018, from the hot pad at Vandenberg Air Force Base in California. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer will launch on June 15, 2018, from Kwajalein Atoll in the Marshall Islands (June 14 in the continental United States). ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

Northrop Grumman's L-1011 Stargazer is ready for takeoff Oct. 19, 2018, from the hot pad at Vandenberg Air Force Base in California. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The Pegasus XL rocket will launch from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

Northrop Grumman's L-1011 Stargazer takes off from the hot pad at Vandenberg Air Force Base in California on Oct. 19, 2018. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The Pegasus XL rocket will launch from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

Northrop Grumman's L-1011 Stargazer is ready for takeoff Oct. 19, 2018, from the hot pad at Vandenberg Air Force Base in California. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The Pegasus XL rocket will launch from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology and communications systems.

1st Lt. Daniel Smith, launch weather officer, 30th Space Wing, Vandenberg Air Force Base, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Helen Fricker, Scripps Institution of Oceanography, La Jolla, California, ICESat-2 science definition team member, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Tim Dunn, launch director, NASA's Kennedy Space Center in Florida, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Tim Dunn, launch director, NASA's Kennedy Space Center in Florida, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Cathy Richardson, Deputy Program Manager, Earth Science Projects Division, NASA Goddard Space Flight Center, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Lori Magruder, University of Texas at Austin, ICESat-2 science definition team lead, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Tom Neumann, ICESat-2 deputy project scientist, NASA's Goddard Space Flight Center, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Michelle Thaller, NASA Communications (left), and Tom Wagner, ICESat-2 program scientist, NASA Headquarters (right) speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Tom Neumann, ICESat-2 deputy project scientist, NASA's Goddard Space Flight Center, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Scott Messer, program manager, NASA Programs, United Launch Alliance, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Doug McLennan, ICESat-2 project manager, NASA’s Goddard Space Flight Center, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Bill Barnhart, ICESat-2 program manager, Northrop Grumman, speaks to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT).

Social media participant sketches NASA and industry leaders speaking to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2) on Sept. 13, 2018, at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT). The satellite will measure the height of our changing Earth, one laser pulse at a time, 10,000 laser pulses per second. ICESat-2 will provide scientists with height measurements that create a global portrait of Earth's third dimension, gathering date that can precisely track changes of terrain, including glaciers, sea ice and forests.

A photon demonstration was conducted in front of news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2), a mission to measure the changing height of Earth's ice, on Sept. 13, 2018 at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT). The satellite will measure the height of our changing Earth, one laser pulse at a time, 10,000 laser pulses per second. ICESat-2 will provide scientists with height measurements that create a global portrait of Earth's third dimension, gathering date that can precisely track changes of terrain, including glaciers, sea ice and forests.

NASA and industry leaders speak to members of the news media and social media participants during a prelaunch mission briefing for NASA's Ice, Cloud and land Elevation Satellite-2 (ICESat-2) on Sept. 13, 2018, at Vandenberg Air Force Base (VAFB) in California. ICESat-2 will launch aboard a United Launch Alliance Delta II, the rocket’s final mission, from Space Launch Complex 2 at VAFB. Launch is scheduled for 8:46 a.m. EDT (5:46 a.m. PDT). The satellite will measure the height of our changing Earth, one laser pulse at a time, 10,000 laser pulses per second. ICESat-2 will provide scientists with height measurements that create a global portrait of Earth's third dimension, gathering date that can precisely track changes of terrain, including glaciers, sea ice and forests.

The Northrop Grumman Pegasus XL vehicle is inside Building 1555 at Vandenberg Air Force Base in California, on Oct. 8, 2018. The payload fairing is installed around NASA's Ionospheric Connection Explorer (ICON). The Pegasus XL, attached to the company's L-1011 Stargazer aircraft, will launch from the Skid Strip at Cape Canaveral Air Force Station in Florida. Launch is scheduled for Oct. 26. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The Northrop Grumman Pegasus XL vehicle is inside Building 1555 at Vandenberg Air Force Base in California, on Oct. 8, 2018. The payload fairing is installed around NASA's Ionospheric Connection Explorer (ICON). The Pegasus XL, attached to the company's L-1011 Stargazer aircraft, will launch from the Skid Strip at Cape Canaveral Air Force Station in Florida. Launch is scheduled for Oct. 26. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

In the Astrotech facility at Vandenberg Air Force Base in California, the heatshield is placed on NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, Mars lander. InSight will be the first mission to look deep beneath the Martian surface. It will study the planet's interior by measuring its heat output and listen for marsquakes. The spacecraft will use the seismic waves generated by marsquakes to develop a map of the planet’s deep interior. The resulting insight into Mars’ formation will provide a better understanding of how other rocky planets, including Earth, were created. InSight is scheduled for liftoff May 5, 2018.

In the Astrotech facility at Vandenberg Air Force Base in California, the heatshield is placed on NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, Mars lander. InSight will be the first mission to look deep beneath the Martian surface. It will study the planet's interior by measuring its heat output and listen for marsquakes. The spacecraft will use the seismic waves generated by marsquakes to develop a map of the planet’s deep interior. The resulting insight into Mars’ formation will provide a better understanding of how other rocky planets, including Earth, were created. InSight is scheduled for liftoff May 5, 2018.

In the Astrotech facility at Vandenberg Air Force Base in California, NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, Mars lander is prepared for encapsulation in its payload fairing. InSight will be the first mission to look deep beneath the Martian surface. It will study the planet's interior by measuring its heat output and listen for marsquakes. The spacecraft will use the seismic waves generated by marsquakes to develop a map of the planet’s deep interior. The resulting insight into Mars’ formation will provide a better understanding of how other rocky planets, including Earth, were created. InSight is scheduled for liftoff May 5, 2018.

In the Astrotech facility at Vandenberg Air Force Base in California, the heatshield is lifted for placement on NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, Mars lander. InSight will be the first mission to look deep beneath the Martian surface. It will study the planet's interior by measuring its heat output and listen for marsquakes. The spacecraft will use the seismic waves generated by marsquakes to develop a map of the planet’s deep interior. The resulting insight into Mars’ formation will provide a better understanding of how other rocky planets, including Earth, were created. InSight is scheduled for liftoff May 5, 2018.

In the Astrotech facility at Vandenberg Air Force Base in California, the heatshield is placed on NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, Mars lander. InSight will be the first mission to look deep beneath the Martian surface. It will study the planet's interior by measuring its heat output and listen for marsquakes. The spacecraft will use the seismic waves generated by marsquakes to develop a map of the planet’s deep interior. The resulting insight into Mars’ formation will provide a better understanding of how other rocky planets, including Earth, were created. InSight is scheduled for liftoff May 5, 2018.

In the Astrotech facility at Vandenberg Air Force Base in California, the heatshield is placed on NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, Mars lander. InSight will be the first mission to look deep beneath the Martian surface. It will study the planet's interior by measuring its heat output and listen for marsquakes. The spacecraft will use the seismic waves generated by marsquakes to develop a map of the planet’s deep interior. The resulting insight into Mars’ formation will provide a better understanding of how other rocky planets, including Earth, were created. InSight is scheduled for liftoff May 5, 2018.

In the Astrotech facility at Vandenberg Air Force Base in California, technicians and engineers monitor progress as NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, Mars lander is prepared for encapsulation in its payload fairing. InSight will be the first mission to look deep beneath the Martian surface. It will study the planet's interior by measuring its heat output and listen for marsquakes. The spacecraft will use the seismic waves generated by marsquakes to develop a map of the planet’s deep interior. The resulting insight into Mars’ formation will provide a better understanding of how other rocky planets, including Earth, were created. InSight is scheduled for liftoff May 5, 2018.

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius_SAC-D spacecraft is secured to the Rotation and Test Fixture in cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. There, the spacecraft will undergo inspection of its solar arrays and tests will be conducted on its propulsion subsystem. Further testing of the satellites various other systems will follow. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA_Randy Beaudoin, VAFB

The Northrop Grumman Pegasus XL rocket containing NASA's Ionospheric Connection Explorer (ICON) is seen outside the cleanroom after assembly at Vandenberg Air Force Base in California on Sept 19, 2019. ICON launched on the Pegasus XL rocket, attached beneath the company's L-1011 Stargazer aircraft, on Oct. 10, 2019, after takeoff from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, the three stages of the Pegasus XL launch vehicle are seen immediately prior to installation of the vehicle’s wing. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, the three stages of the Pegasus XL launch vehicle are seen immediately prior to installation of the vehicle’s wing. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, the three stages of the Pegasus XL launch vehicle are seen immediately prior to installation of the vehicle’s wing. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, technicians prepare the wing for final installation on the Pegasus XL launch vehicle. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, technicians monitor the progress as the wing is lowered for final installation on the Pegasus XL launch vehicle. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, technicians help guide the wing for final installation on the Pegasus XL launch vehicle. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, technicians complete final installation of the wing on the Pegasus XL launch vehicle. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, technicians monitor the progress as the wing is lowered for final installation on the Pegasus XL launch vehicle. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, the three stages of the Pegasus XL launch vehicle are seen immediately prior to installation of the vehicle’s wing. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, a technician helps guide a crane away after final wing installation on the Pegasus XL launch vehicle. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, the wing is lowered onto the Pegasus XL launch vehicle for final installation. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, technicians complete final installation of the wing on the Pegasus XL launch vehicle. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- In a processing facility at Vandenberg Air Force Base in California, the three stages of the Pegasus XL launch vehicle are seen immediately prior to installation of the vehicle’s wing. The Orbital Sciences Corp. Pegasus rocket will launch the Nuclear Spectroscopic Telescope Array (NuSTAR) into space. After the rocket and spacecraft are processed at Vandenberg, they will be flown on the Orbital Sciences’ L-1011 carrier aircraft to the Ronald Reagan Ballistic Missile Defense Test Site at the Pacific Ocean’s Kwajalein Atoll for launch. The high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. For more information, visit science.nasa.gov_missions_nustar_. Photo credit: NASA_Randy Beaudoin, VAFB

Northrop Grumman's L-1011 Stargazer takes off from the hot pad at Vandenberg Air Force Base in California on June 6, 2018. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer will launch on June 15, 2018, from Kwajalein Atoll in the Marshall Islands (June 14 in the continental United States). ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

Northrop Grumman's L-1011 Stargazer soars upward after takeoff from the hot pad at Vandenberg Air Force Base in California on June 6, 2018. The company's Pegasus XL rocket, containing NASA's Ionospheric Connection Explorer (ICON), is attached beneath the aircraft. The explorer will launch on June 15, 2018, from Kwajalein Atoll in the Marshall Islands (June 14 in the continental United States). ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The Joint Polar Satellite System-1, or JPSS-1, arrives at the Astrotech Processing Facility at Vandenberg Air Force Base in California. JPSS is the first in a series four next-generation environmental satellites in a collaborative program between the National Oceanic and Atmospheric Administration (NOAA) and NASA. The satellite is scheduled to liftoff later this year atop a United Launch Alliance Delta II rocket.

The Joint Polar Satellite System-1, or JPSS-1, arrives at the Astrotech Processing Facility at Vandenberg Air Force Base in California. JPSS is the first in a series four next-generation environmental satellites in a collaborative program between the National Oceanic and Atmospheric Administration (NOAA) and NASA. The satellite is scheduled to liftoff later this year atop a United Launch Alliance Delta II rocket.

The Joint Polar Satellite System-1, or JPSS-1, arrives at the Astrotech Processing Facility at Vandenberg Air Force Base in California. JPSS is the first in a series four next-generation environmental satellites in a collaborative program between the National Oceanic and Atmospheric Administration (NOAA) and NASA. The satellite is scheduled to liftoff later this year atop a United Launch Alliance Delta II rocket.

The Joint Polar Satellite System-1, or JPSS-1, arrives at the Astrotech Processing Facility at Vandenberg Air Force Base in California. JPSS is the first in a series four next-generation environmental satellites in a collaborative program between the National Oceanic and Atmospheric Administration (NOAA) and NASA. The satellite is scheduled to liftoff later this year atop a United Launch Alliance Delta II rocket.

Technicians prepare to install the solar array for NASA's Ionospheric Connection Explorer (ICON) inside Building 1555 at Vandenberg Air Force Base in California on Aug. 28, 2019. ICON launched on a Northrop Grumman Pegasus XL rocket, attached beneath the company's L-1011 Stargazer aircraft, on Oct. 10, 2019, after takeoff from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The wing for the Orbital ATK Pegasus XL rocket was offloaded from a truck and transporter to Building 1555 at Vandenberg Air Force Base in California. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

Technicians install the solar array for NASA's Ionospheric Connection Explorer (ICON) inside Building 1555 at Vandenberg Air Force Base in California on Aug. 28, 2019. ICON launched on a Northrop Grumman Pegasus XL rocket, attached beneath the company's L-1011 Stargazer aircraft, on Oct. 10, 2019, after takeoff from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

Workers unload the wing for the Orbital ATK Pegasus XL rocket from a truck at Building 1555 at Vandenberg Air Force Base in California. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

NASA's Ionospheric Connection Explorer (ICON) is ready for solar array installation inside Building 1555 at Vandenberg Air Force Base in California on Aug. 28, 2019. ICON launched on a Northrop Grumman Pegasus XL rocket, attached beneath the company's L-1011 Stargazer aircraft, on Oct. 10, 2019, after takeoff from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

Technicians install the solar array for NASA's Ionospheric Connection Explorer (ICON) inside Building 1555 at Vandenberg Air Force Base in California on Aug. 28, 2019. ICON launched on a Northrop Grumman Pegasus XL rocket, attached beneath the company's L-1011 Stargazer aircraft, on Oct. 10, 2019, after takeoff from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

Technicians prepare to install the solar array for NASA's Ionospheric Connection Explorer (ICON) inside Building 1555 at Vandenberg Air Force Base in California on Aug. 28, 2019. ICON launched on a Northrop Grumman Pegasus XL rocket, attached beneath the company's L-1011 Stargazer aircraft, on Oct. 10, 2019, after takeoff from the Skid Strip at Cape Canaveral Air Force Station in Florida. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

Workers transfer the wing for the Orbital ATK Pegasus XL rocket from a truck to a forklift at Building 1555 at Vandenberg Air Force Base in California. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The wing for the Orbital ATK Pegasus XL rocket arrives by truck at Building 1555 at Vandenberg Air Force Base in California. The Pegasus rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The U.S.-European Sentinel-6 Michael Freilich ocean-monitoring satellite is encapsulated in the SpaceX Falcon 9 rocket’s payload fairing on Nov. 3, 2020, inside SpaceX’s Payload Processing Facility at Vandenberg Air Force Base (VAFB) in California. Sentinel-6 is scheduled to launch on Nov. 21, 2020, at 12:17 p.m. EST (9:17 a.m. PST), from Space Launch Complex 4E at VAFB. The Launch Services Program at NASA’s Kennedy Space Center in Florida is responsible for launch management.

The U.S.-European Sentinel-6 Michael Freilich ocean-monitoring satellite is being encapsulated in the SpaceX Falcon 9 rocket’s payload fairing on Nov. 3, 2020, inside SpaceX’s Payload Processing Facility at Vandenberg Air Force Base (VAFB) in California. Sentinel-6 is scheduled to launch on Nov. 21, 2020, at 12:17 p.m. EST (9:17 a.m. PST), from Space Launch Complex 4E at VAFB. The Launch Services Program at NASA’s Kennedy Space Center in Florida is responsible for launch management.

The U.S.-European Sentinel-6 Michael Freilich ocean-monitoring satellite is encapsulated in the SpaceX Falcon 9 rocket’s payload fairing on Nov. 3, 2020, inside SpaceX’s Payload Processing Facility at Vandenberg Air Force Base (VAFB) in California. Sentinel-6 is scheduled to launch on Nov. 21, 2020, at 12:17 p.m. EST (9:17 a.m. PST), from Space Launch Complex 4E at VAFB. The Launch Services Program at NASA’s Kennedy Space Center in Florida is responsible for launch management.

The U.S.-European Sentinel-6 Michael Freilich ocean-monitoring satellite is being encapsulated in the SpaceX Falcon 9 rocket’s payload fairing on Nov. 3, 2020, inside SpaceX’s Payload Processing Facility at Vandenberg Air Force Base (VAFB) in California. Sentinel-6 is scheduled to launch on Nov. 21, 2020, at 12:17 p.m. EST (9:17 a.m. PST), from Space Launch Complex 4E at VAFB. The Launch Services Program at NASA’s Kennedy Space Center in Florida is responsible for launch management.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. Technicians confirm that the spacecraft is secured onto a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. Technicians prepare the spacecraft for its move to a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. Technicians prepare the spacecraft for its move to a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. Technicians assist as a crane lowers the spacecraft toward a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. Technicians assist as a crane lifts the spacecraft up for its move to a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. Technicians help secure the spacecraft onto a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. The spacecraft is being prepared for its move to a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. Technicians assist as a crane lifts and moves the spacecraft to a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. A crane is attached to the spacecraft to prepare for its move to a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

NOAA's Joint Polar Satellite System-1, or JPSS-1, remains wrapped in a protective covering after removal from its shipping container at the Astrotech Processing Facility at Vandenberg Air Force Base in California. The spacecraft is being prepared for its move to a payload attach fitting. JPSS-1 will liftoff aboard a United Launch Alliance Delta II rocket from Vandenberg's Space Launch Complex-2. JPSS-1 is the first in a series of four next-generation environmental satellites in a collaborative program between NOAA and NASA.

At Vandenberg Air Force Base in California, the aft stub adapter (ASA) and nozzle for a United Launch Alliance Atlas V rocket is removed from its shipping container. The launch vehicle will send NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, spacecraft to land on Mars. InSight is the first mission to explore the Red Planet's deep interior. It will investigate processes that shaped the rocky planets of the inner solar system including Earth. Liftoff from Vandenberg is scheduled for May 5, 2018.

The first stage motor for the Orbital ATK Pegasus XL rocket arrives by truck at Building 1555 at Vandenberg Air Force Base in California. The Pegasus rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The first stage motor for the Orbital ATK Pegasus XL rocket was moved inside Building 1555 at Vandenberg Air Force Base in California. In the background are the second and third stage segments. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The first stage motor for the Orbital ATK Pegasus XL rocket was moved inside Building 1555 at Vandenberg Air Force Base in California. In the background are the second and third stage segments. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The first stage motor for the Orbital ATK Pegasus XL rocket is moved into Building 1555 at Vandenberg Air Force Base in California. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The first stage motor for the Orbital ATK Pegasus XL rocket is offloaded from a truck at Building 1555 at Vandenberg Air Force Base in California. The Pegasus rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The first stage motor for the Orbital ATK Pegasus XL rocket is moved inside Building 1555 at Vandenberg Air Force Base in California. In the background are the second and third stage segments. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The first stage motor for the Orbital ATK Pegasus XL rocket is offloaded from a truck at Building 1555 at Vandenberg Air Force Base in California. The Pegasus rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The first stage motor for the Orbital ATK Pegasus XL rocket was moved inside Building 1555 at Vandenberg Air Force Base in California. In the background are the second and third stage segments. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The first stage motor for the Orbital ATK Pegasus XL rocket is moved inside Building 1555 at Vandenberg Air Force Base in California. In the background are the second and third stage segments. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.

The first stage motor for the Orbital ATK Pegasus XL rocket was moved inside Building 1555 at Vandenberg Air Force Base in California. In the background are the second and third stage segments. The rocket is being prepared for NASA's Ionospheric Connection Explorer, or ICON, mission. ICON will launch from the Kwajalein Atoll aboard the Pegasus XL on Dec. 8, 2017. ICON will study the frontier of space - the dynamic zone high in Earth's atmosphere where terrestrial weather from below meets space weather above. The explorer will help determine the physics of Earth's space environment and pave the way for mitigating its effects on our technology, communications systems and society.