NASA’s Orbiting Carbon Observatory-2 (OCO-2) is in final preparations for a July 1 launch from Vandenberg AFB, Calif., atop a United Launch Alliance Delta II rocket. OCO-2 is slated to be NASA’s first spacecraft dedicated to measuring carbon dioxide levels in the Earth’s atmosphere; the original OCO was lost in 2009 when the fairing on its Taurus launch vehicle failed to open during ascent. From its 438-mi. (705-km) near-polar orbit, OCO-2 will provide a more complete, ...


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