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VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, Orbital Science's Jose Castillo and Mark Neuse (right) move in to remove the fairing payload access door on NASA's Orbiting Carbon Observatory, or OCO, spacecraft. Orbital Science's Glenn Weigle and Brett Gladish are nearby (shadows on the fairing) to take the GN2 flow reading. The encapsulated OCO tops Orbital Sciences' Taurus XL rocket, which is scheduled to launch Feb. 24. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo courtesy of Glenn Weigle, Orbital Sciences KSC-2009-1719

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vand...

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, Orbital Science's Jose Castillo and Mark Neuse (right) move in to remove the fairing payload access doo... More

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers prepare NASA's Orbiting Carbon Observatory, or OCO, upper stack for attachment to Orbital Sciences' Taurus XL rocket's Stage 0. The upper stack consists of Stages 1, 2 and 3 of the Taurus as well as the encapsulated OCO spacecraft. Orbital Sciences workers put the non-flight environmental shield over the fairing prior to erection. A portion of the umbilical tower (above it) is attached to the upper stack. OCO is scheduled for launch aboard the Taurus Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Dan Liberotti, VAFB KSC-2009-1717

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vande...

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers prepare NASA's Orbiting Carbon Observatory, or OCO, upper stack for attachment to Orbital Scienc... More

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, upper stack is prepared to be raised to vertical. The upper stack, consists of Stages 1, 2 and 3 of Orbital Sciences' Taurus XL rocket as well as the encapsulated OCO spacecraft. Once vertical, the upper stack will be lifted and attached to the Taurus Stage 0, at left. OCO is scheduled for launch aboard the Taurus Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Dan Liberotti, VAFB KSC-2009-1715

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vande...

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, upper stack is prepared to be raised to vertical. The upper ... More

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, upper stack is prepared to be raised to vertical. The upper stack, consists of Stages 1, 2 and 3 of Orbital Sciences' Taurus XL rocket as well as the encapsulated OCO spacecraft. Once vertical, the upper stack will be lifted and attached to the Taurus Stage 0, at left. OCO is scheduled for launch aboard the Taurus Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Dan Liberotti, VAFB KSC-2009-1716

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vande...

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, upper stack is prepared to be raised to vertical. The upper ... More

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, spacecraft waits atop Orbital Sciences' Taurus XL rocket to launch Feb. 24. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo courtesy of Glenn Weigle, Orbital Sciences KSC-2009-1721

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vande...

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, spacecraft waits atop Orbital Sciences' Taurus XL rocket to ... More

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, the crane, at left, is attached to NASA's Orbiting Carbon Observatory, or OCO, upper stack to lift and attach the spacecraft to Orbital Sciences' Taurus XL rocket's Stage 0 (within the scaffolding). A portion of the umbilical tower (above it) is attached to the upper stack. The upper stack consists of Stages 1, 2 and 3 of the Taurus as well as the encapsulated OCO spacecraft. OCO is scheduled for launch aboard the Taurus Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Dan Liberotti, VAFB KSC-2009-1718

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vande...

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, the crane, at left, is attached to NASA's Orbiting Carbon Observatory, or OCO, upper stack to lift and a... More

VANDENBERG AIR FORCE BASE, Calif. -- With the fairing door off, Orbital Science's Jose Castillo and Mark Neuse remove the fairing payload access door on NASA's Orbiting Carbon Observatory, or OCO, spacecraft on Launch Complex 576-E at Vandenberg Air Force Base in California. Orbital Science's Glenn Weigle and Brett Gladish stand by to take the GN2 flow reading The encapsulated OCO tops Orbital Sciences' Taurus XL rocket, which is scheduled to launch Feb. 24. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo courtesy of Glenn Weigle, Orbital Sciences KSC-2009-1720

VANDENBERG AIR FORCE BASE, Calif. -- With the fairing door off, Orbit...

VANDENBERG AIR FORCE BASE, Calif. -- With the fairing door off, Orbital Science's Jose Castillo and Mark Neuse remove the fairing payload access door on NASA's Orbiting Carbon Observatory, or OCO, spacecraft o... More

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, spacecraft awaits a GN2 instrument purge flow test in preparation for launch Feb. 24. The spacecraft sits atop Orbital Sciences' Taurus XL rocket. At right is a portion of the umbilical tower attached to the upper stack. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo courtesy of Jim Stowers, Orbital Sciences KSC-2009-1722

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vande...

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, NASA's Orbiting Carbon Observatory, or OCO, spacecraft awaits a GN2 instrument purge flow test in prepar... More