Scientists Discovered a Mind-Boggling Chasm on Mercury

Scientists Discovered a Mind-Boggling Chasm on Mercury
Placed on Earth, it would stretch from Washington DC to New York to Denver. Larger than the Grand Canyon, wider and deeper than East Africa’s Great Rift Valley, Mercury’s newly-discovered “Great Valley” boggles the imagination.

http://ift.tt/2fDWjiO November 18, 2016 at 10:41PM
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