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NASA rover discovers liquid water 'ripples' carved into Mars rock
NASA's Curiosity rover photographed remnants of rippling waves in an ancient Martian lakebed, proving that the Red Planet had open water for longer in its history than previously thought.
Planetary geologists and astronomers studying Mars have known for decades that water was once likely present on the planet, after NASA's Mariner 9 mission captured images of dry gullies in the 1970s. (Image credit: NASA/JPL-Caltech/MSSS)Both dry lakebeds appear to have formed around 3.7 billion years ago, indicating that Mars had an atmosphere dense and warm enough to support liquid water for longer than previously thought — which could have intriguing implications. As the powerful solar wind bombarded the Martian atmosphere, most of the planet's carbon dioxide and water evaporated into space, leaving behind the frigid desert we know today.
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