The 3.7-billion-year-old formations in the planet's Gale Crater suggest the presence of long-gone bodies of liquid water, with no ice covering the surface ...
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Curiosity Rover Uncovers 3.7-Billion-Year-Old Ripples That Suggest Mars Once Had Ice-Free LakesThe ripples, formed 3.7 billion years ago, suggest that the Red Planet’s climate during that time was warm and dense enough to support liquid water exposed to the atmosphere.
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