Nature > Water

Many of Mars' stream valleys might have formed under an ice sheet

1 month ago   |   By Ars Technica

Enlarge / Examples of different types of valleys on Mars. (credit: Galofre et al./Nature Geoscience )
The further back into Earth's history your mind wanders, the more work your imagination has to put in. That's 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' surface. The Red Planet's southern hemisphere highlands host many valleys, which have...
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