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doit_the_clown doit_the_clown
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7 years ago
Evidence for water stored as permafrost under the Martian surface is shown in

(a)   river valleys extending away from obvious impact craters.
(b)   the darker color of some parts of the surface of Mars.
(c)   haze layers and steam vents seen by orbiting spacecraft near to active volcanoes on Mars.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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hyponoticahyponotica
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