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Blue, not red: did ancient Mars look like this?

It's hard to imagine what Mars might've looked like when its valleys were filled with water and its thick atmosphere sported white fluffy clouds. Now try to imagine what ancient Mars might look like with its own<em style=" margin: {margin-top=0, margin-right=0, margin-bottom=0, margin-left=0}; padding: {padding-top=0, padding-right=0, padding-bottom=0, padding-left=0};">biosphere</em>.

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