Mars' rivers were red. Traces of previous rivers, streams, and lakes are seen everywhere. No one knows why they dried up three billion years ago
New study explores Martian river trails for clues on water and atmospheric history
Many scientists previously thought losing carbon dioxide from Mars' atmosphere caused the problem.
The latest findings, published May 25 in Science Advances, show that the alteration was triggered by the loss of another key component
In 1972, NASA's Mariner 9 orbited Mars and sent back stunning images
The photographs showed riverbeds, suggesting that the planet formerly had liquid water even though it's dry today
Since Mars lacks tectonic plates to alter and bury rock, old river trails remain on the surface like abandoned evidence
This allowed Researchears to evaluate satellite-taken maps.
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