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Two weeks ago, NASA's Opportunity Rover discovered the largest meteorite yet observed on Mars. Sure, any space debris can be an exciting discovery, but the rock's size has its own cool implications: Mars's atmosphere used to be a lot thicker. More »
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Just ten million years ago (a geological eyeblink), Mars could've had an ice age. Even cooler, it may have been one of several, meaning the planet underwent freeze/thaw periods much like those here on Earth. And that means — you guessed it — the chances for liquid water and life on the Red Planet just went way up. Cooler still, those glaciers likely had liquid water near their base, and seeping into the rocks below. A new study in the journal Geology based on images from the Mars Reconnaissance Orbiter has found compelling evidence that sheets of ice between 1 and 2.5 kilometers thick grew near the Martian equator some time in the recent past. More »
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