In pictures: 20 key NASA projects in 2009

From the space shuttle and Mars mission to water on the moon and ice on the Earth, NASA has its hands in a variety of critical projects

Mars is where it's at: NASA and the European Space Agency (ESA) in November said they are aiming to cooperate on all manner of robotic orbiters, landers and exploration devices for a future trip to Mars. Specifically, NASA and ESA recently agreed to consider the establishment of a new joint initiative to define and implement their scientific, programmatic and technological goals for the exploration of Mars. The program would focus on several launch opportunities with landers and orbiters conducting astrobiological, geological, geophysical, climatological, and other high-priority investigations and aimed at returning samples from Mars in the mid-2020s.

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