NASA's Curiosity rover has been on the surface of Mars for a month now, and it recently collected a sample of the air around it for the first time since landing on the surface of the Red Planet. Among its various other duties, one of Curiosity's goals is to study the air composition on Mars, and it does so by collecting air samples with its Sample Analysis at Mars instrument (Sam). Of course, NASA scientists already know what to expect when the sample results come back - carbon dioxide, and lots of it.
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