In Pictures: 21 critical future NASA missions

NASA space plans include trips to Mars, Jupiter, Pluto and the Sun as well as climate change operations

Carbon footprint: NASA is looking to develop the Orbiting Carbon Observatory-2 mission for launch early in 2013. The satellite is expected to measure CO2 in the Earth's atmosphere whose levels, since the beginning of the industrial age, have increased by about 38%. The original OCO satellite failed before it reached orbit, NASA said.

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