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VANDENBERG AIR FORCE BASE, Calif. -- An Alliant motor designated for Stage 3 of a Taurus rocket is weighed by Orbital Sciences workers in Building 1555 at Vandenberg AFB. The Taurus will launch the Orbiting Carbon Observatory, or OCO, in January 2009. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program. OCO will provide space-based observations of atmospheric carbon dioxide (CO2), the principal human-initiated driver of climate change. Mature technologies will be used to address NASA's highest priority carbon cycle measurement requirement. NASA's Jet Propulsion Laboratory leads the OCO effort. Orbital Sciences Corporation is providing the Taurus launch vehicle; Hamilton Sundstrand Sensor Systems, the OCO spacecraft. Photo credit: NASA/Randy Beaudoin