Mars exploration. Artwork of astronauts on Mars examining a rock core sample obtained by the drill mounted on their rover. The astronauts are part of NASA's Constellation Program, a US space program announced in 2004, which is intended to put astronauts back on the Moon by 2020, followed by missions to Mars, the third planet from the Sun. Mars is a cold, desert world with a thin atmosphere of carbon dioxide. Studies of Martian rocks will reveal their mineral content and provide evidence for theories about Martian geology and water on Mars.
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