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Mars once had rivers, lakes, and possibly oceans, and it lost all of them for one reason — its molten core cooled, its magnetic field died, and the solar wind stripped the planet’s air into space.

Mars wasn't always frozen and barren. Billions of years ago it had flowing rivers, standing lakes, and possibly oceans. It lost all of it because of something happening deep inside the planet: its…

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Harrison Kass3d agoen

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