* Astronomy

Buried Mars River Channel Reveals Evidence of Relatively Recent Megaflooding

Evidence of a megaflood on Mars - a surprisingly recent one that cut a 966-kilometer river channel into the planet - has been detected by radar from an orbiting satellite.
Scientists have known for some time about the existence of the Marte Vallis channel system. But the new radar research has doubled the estimated depth of the massive flow and identified the headwaters and floodplain of the river. Both had been covered by lava from a volcanic eruption no more than 500 million years ago. 
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