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In this online card game, players prepare five important NASA Earth missions. The object of the game is to be the first to complete three of five missions. A mission is completed when all four of its required components have been supplied. Each mission needs a rocket, an orbit, a spacecraft, and a science objective. There are different kinds of each of these components; each mission needs a different combination of the components. The game is based on real NASA Earth missions: Aqua, Aura, CloudSat, IceSat, and Terra.