An aerial view of NASA's mobile launcher (ML) atop crawler-transporter 2 as it moves along the crawlerway to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. In view on top of the ML is the American flag. The ML will undergo a fit check on the surface of the pad, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

An aerial view of NASA's mobile launcher (ML) atop crawler-transporter 2 as it moves along the crawlerway, making the turn to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. In view on top of the ML is the American flag. The ML will undergo a fit check on the surface of the pad, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 arrives at the top of Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 arrives at Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 approaches Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 begins its trek to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check on the surface of the pad, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

An aerial view of NASA's mobile launcher (ML) atop crawler-transporter 2 as it begins its trek to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check on the surface of the pad, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 arrives at Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 arrives at Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

With a view of the flame trench and flame deflector below, NASA's mobile launcher (ML) atop crawler-transporter 2 arrives at Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

A liquid hydrogen storage tank is in view as NASA's mobile launcher (ML) atop crawler-transporter 2 makes its way up the ramp at Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 arrives at the top of Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

An aerial view of NASA's mobile launcher (ML) atop crawler-transporter 2 as it moves along the crawlerway to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check on the surface of the pad, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 arrives at Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 arrives at the top of Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

A bright blue sky serves as a backdrop as NASA's mobile launcher (ML) atop crawler-transporter 2 arrives at Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

An aerial view of NASA's mobile launcher (ML) atop crawler-transporter 2 as it moves along the crawlerway to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check on the surface of the pad, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Mike Bolger, program manager of Exploration Ground Systems, speaks to workers and guests during an employee event for the mobile launcher move to the Vehicle Assembly Building (VAB) on Sept. 7, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher, atop crawler-transporter 2, began its trek from Launch Pad 39B along the crawlerway after undergoing a fit check and several days of systems testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. The mobile launcher will spend seven months in the VAB undergoing testing. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

A close-up view of NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop as it slowly moves along the crawlerway on its trek to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

A close-up view of NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop as it slowly moves along the crawlerway on its trek to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop begins its trek along the crawlerway to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 is at the top of Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars. Photo credit: NASA/Jamie Peer <b><a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a></b>

The American flag is in view as NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop slowly moves along the crawlerway on its trek to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Members of the crawler team watch as NASA's mobile launcher (ML) atop crawler-transporter 2 (CT-2) moves along the crawlerway on its trek to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop begins its trek along the crawlerway to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. At left is the iconic Vehicle Assembly Building. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

A truck sprays water to reduce the dust as NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop slowly moves along the crawlerway on its trek to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop slowly moves along the crawlerway on its trek to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 (CT-2) moves along the crawlerway on its trek to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 is at the top of Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars. Photo credit: NASA/Jamie Peer <b><a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a></b>

A close-up view of NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop as it slowly moves along the crawlerway on its trek to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 (CT-2) moves along the crawlerway on its trek to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 (CT-2) moves along the crawlerway on its trek to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

A close-up view of NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop as it slowly moves along the crawlerway on its trek to Launch Pad 39B on Aug. 30, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

A truck sprays water to reduce the dust as NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop slowly moves along the crawlerway on its trek to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 (CT-2) moves along the crawlerway on its trek to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher (ML) atop crawler-transporter 2 is at the top of Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars. Photo credit: NASA/Jamie Peer <b><a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html" rel="nofollow">NASA image use policy.</a></b>

NASA's crawler-transporter 2 (CT-2) with the mobile launcher (ML) atop slowly moves along the crawlerway on its trek to Launch Pad 39B on Aug. 31, 2018, at the agency's Kennedy Space Center in Florida. CT-2 will move the ML up to the surface of the pad where it will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Preparations are underway to move NASA's mobile launcher, atop crawler-transporter 2, into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, is at the entrance to High Bay 3 at the Vehicle Assembly Building (VAB) at sunrise on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

As a brilliant sun shines through, NASA's mobile launcher, atop crawler-transporter 2, begins the move into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher atop crawler-transporter 2 travels slowly along the crawlerway on Sept. 7, 2018, on its way to the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control. Pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, begins the move into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, is at the entrance to High Bay 3 at the Vehicle Assembly Building (VAB) just before sunrise on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Technicians remove special planks covering tracks as NASA's mobile launcher, atop crawler-transporter 2, moves into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher atop crawler-transporter 2 travels slowly along the crawlerway on Sept. 7, 2018, on its way to the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control. Pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher atop crawler-transporter 2 begins its trek off of Launch Pad 39B on Sept. 7, 2018, at NASA's Kennedy Space Center in Florida. After undergoing a fit check and several days of systems testing with the pad, the mobile launcher is on its way to the Vehicle Assembly Building. This is the first time that the modified mobile launcher made the trip to the pad. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control. Pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Preparations are underway to move NASA's mobile launcher, atop crawler-transporter 2, into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Technicians lay wooden planks down in the tracks to the entrance to High Bay 3 in the Vehicle Assembly Building (VAB), as mobile launcher, atop crawler-transporter 2, moves into the VAB on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

The giant cleats of crawler-transporter 2 are in view as a technician monitors the progress of the move of NASA's mobile launcher, atop the crawler, into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, moves into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, is at the entrance to High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, is at the entrance to High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, begins the move into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Charlie Blackwell-Thompson, Exploration Mission-1 launch director, and Michael Sarafin, EM-1 mission manager, talk to members of the media inside the Launch Control Center at NASA's Kennedy Space Center in Florida, on Sept. 8, 2018. Exploration Ground Systems is preparing the ground systems necessary to launch the agency's Space Launch System and Orion on EM-1, missions to the Moon and on to Mars.

NASA's mobile launcher atop crawler-transporter 2 begins its trek off of Launch Pad 39B on Sept. 7, 2018, at NASA's Kennedy Space Center in Florida. After undergoing a fit check and several days of systems testing with the pad, the mobile launcher is on its way to the Vehicle Assembly Building. This is the first time that the modified mobile launcher made the trip to the pad. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control. Pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Preparations are underway to move NASA's mobile launcher, atop crawler-transporter 2, into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher atop crawler-transporter 2 travels slowly along the crawlerway on Sept. 7, 2018, on its way to the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. During a portion of the trek, several NASA astronauts were aboard the mobile launcher for a bird’s eye view. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control. Pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, moves slowly into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher atop crawler-transporter 2 begins its trek off of Launch Pad 39B on Sept. 7, 2018, at NASA's Kennedy Space Center in Florida. After undergoing a fit check and several days of systems testing with the pad, the mobile launcher is on its way to the Vehicle Assembly Building. This is the first time that the modified mobile launcher made the trip to the pad. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control. Pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, moves slowly into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Technicians remove special planks covering tracks as NASA's mobile launcher, atop crawler-transporter 2, moves into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

NASA's mobile launcher, atop crawler-transporter 2, moves slowly into High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA's Kennedy Space Center in Florida. The mobile launcher departed Launch Pad 39B after several days of testing with the pad. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher will spend seven months in the VAB undergoing testing. The 380-foot-tall structure is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to the agency's Space Launch System and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

The crawler-transporter 2, with NASA's mobile launcher atop, makes its way up the ramp to the top of Launch Pad 39B at NASA's Kennedy Space Center in Florida, on Aug. 31, 2018. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

The crawler-transporter 2, with NASA's mobile launcher atop, makes its way up the ramp to the top of Launch Pad 39B at NASA's Kennedy Space Center in Florida, on Aug. 31, 2018. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

A technician watches as the ignition overpressure water system pipe on the mobile launcher slowly aligns with the pipe on the ground system at Launch Pad 39B at NASA's Kennedy Space Center in Florida, on Aug. 31, 2018. The ML, atop crawler-transporter 2, made the trek along the crawlerway to the pad for a fit check and several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

Crawler-transporter 2, with NASA's mobile launcher atop, is stopped at the top of Launch Pad 39B on Aug. 31, 2018, at NASA's Kennedy Space Center in Florida. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

The crawler-transporter 2, with NASA's mobile launcher atop, makes its way up the ramp to the top of Launch Pad 39B at NASA's Kennedy Space Center in Florida, on Aug. 31, 2018. The ML will undergo a fit check, followed by several days of systems testing. The 380-foot-tall mobile launcher is equipped with the crew access arm and several umbilicals that will provide power, environmental control, pneumatics, communication and electrical connections to NASA's Space Launch System (SLS) and Orion spacecraft. Exploration Ground Systems is preparing the ground systems necessary to launch SLS and Orion on Exploration Mission-1, missions to the Moon and on to Mars.

A view of the mobile launcher (ML) taken from the "eyebrow" of the nearby Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. The ML tower will be equipped with a number of lines, called umbilicals that will connect to the Space Launch System rocket and Orion spacecraft for Exploration Mission-1 (EM-1). The Orion Service Module Umbilical and Core State Forward Skirt Umbilical were recently installed on the ML. The Ground Systems Development and Operations Program is overseeing installation of the umbilicals.

Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. A crane is being used to move scaffolding, or work platforms, around the base of the tower on the ML to continue upgrades and modifications to the structure. The ML is being modified and strengthened to accommodate the weight, size and thrust at launch of NASA's Space Launch System, or SLS, and Orion spacecraft. The ML is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first uncrewed mission, Exploration Mission-1, in 2018.

CAPE CANAVERAL, Fla. – Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. In this aerial view looking down from the surface of the ML, a construction worker welds a section of metal for installation on the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA/Cory Huston

Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. A crane is being used to move scaffolding, or work platforms, around the base of the tower on the ML to continue upgrades and modifications to the structure. The ML is being modified and strengthened to accommodate the weight, size and thrust at launch of NASA's Space Launch System, or SLS, and Orion spacecraft. The ML is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first uncrewed mission, Exploration Mission-1, in 2018.

Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. Scaffolding, or work platforms, have been installed around the base of the tower on the ML to continue upgrades and modifications to the structure. The ML is being modified and strengthened to accommodate the weight, size and thrust at launch of NASA's Space Launch System, or SLS, and Orion spacecraft. The ML is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first uncrewed mission, Exploration Mission-1, in 2018.

Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. Scaffolding, or work platforms, have been installed around the base of the tower on the ML to continue upgrades and modifications to the structure. The ML is being modified and strengthened to accommodate the weight, size and thrust at launch of NASA's Space Launch System, or SLS, and Orion spacecraft. The ML is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first uncrewed mission, Exploration Mission-1, in 2018.

Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. Scaffolding, or work platforms, have been installed around the base of the tower on the ML to continue upgrades and modifications to the structure. The ML is being modified and strengthened to accommodate the weight, size and thrust at launch of NASA's Space Launch System, or SLS, and Orion spacecraft. The ML is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first uncrewed mission, Exploration Mission-1, in 2018.

Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. Scaffolding, or work platforms, have been installed around the base of the tower on the ML to continue upgrades and modifications to the structure. The ML is being modified and strengthened to accommodate the weight, size and thrust at launch of NASA's Space Launch System, or SLS, and Orion spacecraft. The ML is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first uncrewed mission, Exploration Mission-1, in 2018.

This infographic explains NASA’s mobile launchers designed for the agency's Artemis missions to send the Space Launch System rocket, Orion spacecraft, and large payloads to the Moon in a single launch.

This infographic explains NASA’s mobile launchers designed for the agency's Artemis missions to send the Space Launch System rocket, Orion spacecraft, and large payloads to the Moon in a single launch.

Teams with Exploration Ground Systems at NASA’s Kennedy Space Center in Florida continue to work the upgrades and repairs on mobile launcher 1 and Launch Pad 39B on June 13, 2023, ahead of the first critical ground testing for Artemis II. New pavement markings indicate the direction of the emergency egress system terminus from Launch Complex 39B. The team has nearly completed the terminus area, where the emergency egress baskets carrying the astronauts and flight crew will arrive following their safe exit from the mobile launcher. Artemis II will be the first Artemis mission flying crew aboard Orion.

Teams with Exploration Ground Systems at NASA’s Kennedy Space Center in Florida continue to work the upgrades and repairs on mobile launcher 1 and Launch Pad 39B on June 13, 2023, ahead of the first critical ground testing for Artemis II. Teams are re-designing the panels on the flame deflector in the flame trench that withstood damage observed after launch of Artemis I. Artemis II will be the first Artemis mission flying crew aboard Orion.

Teams with Exploration Ground Systems at NASA’s Kennedy Space Center in Florida continue to work the upgrades and repairs on mobile launcher 1 and Launch Pad 39B on June 13, 2023, ahead of the first critical ground testing for Artemis II. Teams are re-designing the panels on the flame deflector in the flame trench that withstood damage observed after launch of Artemis I. Artemis II will be the first Artemis mission flying crew aboard Orion.

Teams with Exploration Ground Systems at NASA’s Kennedy Space Center in Florida continue to work the upgrades and repairs on mobile launcher 1 and Launch Pad 39B on June 13, 2023, ahead of the first critical ground testing for Artemis II. New pavement markings indicate the direction of the emergency egress system terminus from Launch Complex 39B. The team has nearly completed the terminus area, where the emergency egress baskets carrying the astronauts and flight crew will arrive following their safe exit from the mobile launcher. Artemis II will be the first Artemis mission flying crew aboard Orion.

Teams with Exploration Ground Systems at NASA’s Kennedy Space Center in Florida continue to work the upgrades and repairs on mobile launcher 1 and Launch Pad 39B on June 13, 2023, ahead of the first critical ground testing for Artemis II. The crew access arm (CAA) has been extended in this view of the mobile launcher. The CAA is the entry and exit point astronauts will use for access to the Orion spacecraft. Tests will be conducted to ensure the arm and supporting mobile launcher systems are certified to support crewed missions. Artemis II will be the first Artemis mission flying crew aboard Orion.

Teams with Exploration Ground Systems at NASA’s Kennedy Space Center in Florida continue to work the upgrades and repairs on mobile launcher 1 and Launch Pad 39B on June 13, 2023, ahead of the first critical ground testing for Artemis II. Construction is nearly complete on the additional 1.4-million-gallon liquid hydrogen sphere used for propellant loading. Having two liquid hydrogen spheres at the pad allows teams to minimize time between launch attempts for resupplying liquid hydrogen. When completed, workers will test the new tank as part of the verification and validation testing. Artemis II will be the first Artemis mission flying crew aboard Orion.

Teams with Exploration Ground Systems at NASA’s Kennedy Space Center in Florida continue to work the upgrades and repairs on mobile launcher 1 and Launch Pad 39B on June 13, 2023, ahead of the first critical ground testing for Artemis II. New pavement markings indicate the direction of the emergency egress system terminus from Launch Complex 39B. The team has nearly completed the terminus area, where the emergency egress baskets carrying the astronauts and flight crew will arrive following their safe exit from the mobile launcher. Artemis II will be the first Artemis mission flying crew aboard Orion.

Teams with Exploration Ground Systems at NASA’s Kennedy Space Center in Florida continue to work the upgrades and repairs on mobile launcher 1 and Launch Pad 39B on June 13, 2023, ahead of the first critical ground testing for Artemis II. The crew access arm (CAA) has been extended in this view of the mobile launcher. The CAA is the entry and exit point astronauts will use for access to the Orion spacecraft. Tests will be conducted to ensure the arm and supporting mobile launcher systems are certified to support crewed missions. Artemis II will be the first Artemis mission flying crew aboard Orion.

CAPE CANAVERAL, Fla. -- Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. In a view looking down from the top of the ML is the base of the ML and various facilities in the Launch Complex 39 area. The ML is being modified and strengthened to accommodate the weight, size and thrust at launch of NASA's Space Launch System, or SLS, and Orion spacecraft. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The existing 24-foot exhaust hole is being enlarged and strengthened for the larger, heavier SLS rocket. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission-1, in 2017. Photo credit: NASA/Daniel Casper

The engine service platform that will provide access to the core stage of the Space Launch System (SLS) rocket is moved beneath the mobile launcher (ML) in High Bay 3 of the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida on June 14, 2019. The large work platform is designed to provide unrestricted access to the RS-25 engines on the SLS core stage from the ML. The service platform will be used for Artemis 1 and subsequent missions. For Artemis 1, the Orion spacecraft will launch atop the SLS rocket from Launch Pad 39B and begin an approximately three-week mission that will send Orion thousands of miles beyond the Moon. Exploration Ground Systems is overseeing work on the ML.

The engine service platform that will provide access to the core stage of the Space Launch System (SLS) rocket is moved beneath the mobile launcher (ML) in High Bay 3 of the Vehicle Assembly Building at NASA’s Kennedy Space Center in Florida on June 14, 2019. The large work platform is designed to provide unrestricted access to the RS-25 engines on the SLS core stage from the ML. The service platform will be used for Artemis 1 and subsequent missions. For Artemis 1, the Orion spacecraft will launch atop the SLS rocket from Launch Pad 39B and begin an approximately three-week mission that will send Orion thousands of miles beyond the Moon. Exploration Ground Systems is overseeing work on the ML.

A sliver of the Moon is visible just before sunrise at NASA's Kennedy Space Center in Florida. In view is one of the steel structures of the mobile launcher (ML). Several launch umbilicals have been installed on the ML tower. Exploration Ground Systems is overseeing installation of umbilicals and launch accessories on the ML to prepare for the first integrated test flight of the Orion spacecraft on the agency's Space Launch System rocket on Exploration Mission-1.

A colorful sunrise serves as the backdrop for the mobile launcher (ML) at NASA's Kennedy Space Center in Florida. Several launch umbilicals have been installed on the ML tower. Exploration Ground Systems is overseeing installation of umbilicals and launch accessories on the ML to prepare for the first integrated test flight of the Orion spacecraft on the agency's Space Launch System rocket on Exploration Mission-1.

A colorful sunrise serves as the backdrop for the mobile launcher (ML) at NASA's Kennedy Space Center in Florida. Several launch umbilicals have been installed on the ML tower. Exploration Ground Systems is overseeing installation of umbilicals and launch accessories on the ML to prepare for the first integrated test flight of the Orion spacecraft on the agency's Space Launch System rocket on Exploration Mission-1.

CAPE CANAVERAL, Fla. – Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. A construction worker uses a measuring device on the surface of the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA/Cory Huston

CAPE CANAVERAL, Fla. – Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. Construction workers on lifts perform welding work on the exterior of the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA/Cory Huston

CAPE CANAVERAL, Fla. – Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. A construction worker prepares a metal beam that will be attached to the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA/Dimitri Gerondidakis

CAPE CANAVERAL, Fla. -- Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. Construction worker on lifts are preparing to cut and weld sections of the metal walls on the exterior of the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA/Daniel Casper

CAPE CANAVERAL, Fla. – Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. Construction workers check a roped off area beneath the surface of the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA_Dimitri Gerondidakis

CAPE CANAVERAL, Fla. -- Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. A construction worker cuts a piece of steel to resize it for the exterior of the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA/Daniel Casper

CAPE CANAVERAL, Fla. -- Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. Construction workers use an automated cutting tool to precisely trim a small section from one of the steel walls for the exterior of the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA/Daniel Casper

CAPE CANAVERAL, Fla. – Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. A construction worker prepares a metal part for installation on the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA_Dimitri Gerondidakis

CAPE CANAVERAL, Fla. – Modifications continue on the Mobile Launcher, or ML, at the Mobile Launcher Park Site at NASA’s Kennedy Space Center in Florida. A construction worker uses a saw to cut through a portion of the flooring beneath the surface of the ML. In 2013, the agency awarded a contract to J.P. Donovan Construction Inc. of Rockledge, Fla., to modify the ML, which is one of the key elements of ground support equipment that is being upgraded by the Ground Systems Development and Operations Program office at Kennedy. The ML will carry the SLS rocket and Orion spacecraft to Launch Pad 39B for its first mission, Exploration Mission 1, in 2017. Photo credit: NASA_Dimitri Gerondidakis