Something puzzles me about evidence of ancient water flowing on Mars. If temperatures are so low on Mars as to make Carbon Dioxide fall as "snow" from the sky, is that not due to the great distance of Mars from the sun? If Mars has always been where it is relative to the sun, how then could water have flowed on its surface? I am given to understand that water would immediately freeze on contact with the surface of Mars.
I'll be grateful for any simple explanation; I am not a scientist.
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