Science
Many of Mars’ stream valleys might have formed under an ice sheet – Ars Technica
Analysis of valley shapes might alter your mental image of a wet Mars.
Enlarge/ Examples of different types of valleys on Mars.
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The further back into Earths history your mind wanders, the more work your imagination has to put in. Thats even more true for Mars. None of us have physically stepped foot on the present-day version of the planet, and its past was clearly very different from its present, with evidence pointing to flowing and standing water.
Among the relics of the watery past are networks of valleys incised into Mars su…
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