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Discover how Mars once resembled Earth, with an atmosphere, running water, and possibly life, but then lost its atmosphere.
It is an educational content of CK-12 Foundation (to access some of the CK-12 ...
The Curiosity Rover on Mars found evidence of a stream bed that would have been suitable on Earth. Now the search is really on for hard evidence of life.
It is an educational content of CK-12 Foundatio ...
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