Dramatic dried-up river channels over a mile wide and 650 feet deep have been detected on Mars, showcasing how the Red Planet once hosted liquid water at its surface.
Stunning New View of Mars Shows Where Ancient Flowing Water Once Carved Its Surface
Gizmodo - 21 Feb 2019 21:40
Dramatic dried-up river channels over a mile wide and 650 feet deep have been detected on Mars, showcasing how the Red Planet once hosted liquid water at its surface.
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