Ancient river channels on Mars may have formed beneath thick ice sheets, scientists say. It’s an important find, because many have long wondered why Mars is covered with tens of thousands of ancient river valleys, even though climate models have a hard time explaining how it could have been warm enough for flowing water. “It’s farther from the Sun than the Earth,†says Anna Grau Galofre, a physicist at Arizona State University and lead author of a paper in the journal Nature Geoscience.
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