TIL: Why Mars's Ocean Disappeared | Today I Learned

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Mars, the red planet, may not have always been so red. In fact, 3.5 billion years ago it had an ocean that spanned its entire northern hemisphere! Join astrobiologist and National Geographic Emerging Explorer Brendan Mullan on a trip back to when the solar system first began, and find out why Mars’s ocean disappeared—and how Earth escaped that same fate.
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About TIL (Today I Learned):
Love crazy facts? We do too. Get ready to amaze your friends with some of the strangest facts you’ve ever heard. National Geographic explorers tell you new, obscure, and amazing things about the world (and beyond).

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National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible.

Read more about making Mars home in the latest issue of National Geographic magazine and watch MARS, the global event series on National Geographic.

PRODUCER: Laurence Alexander
SERIES PRODUCER: Christopher Mattle
EDITOR: Mónica Pinzóne

TIL: Why Mars's Ocean Disappeared | Today I Learned

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