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Old 31-03-2021, 10:37 PM
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astroron (Ron)
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Join Date: Mar 2005
Location: Cambroon Queensland Australia
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Grau Galofreís theory also helps explain how the valleys would have formed 3.8 billion years ago on a planet that is farther away from the sun than Earth is, during a time when the sun was less intense.

This has always intrigued about Mars.
How could rivers flow when Mars was colder in the past
than it is now?
Cheers
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