Mars once had vast oceans covering its northern hemisphere over 4 billion years ago, evidenced by deltas, sediments, and shorelines, but lost its water when its magnetic field disappeared, allowing solar wind to strip the atmosphere and cause the water to freeze and escape into space.
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Mars Once Had Oceans — And Lost Them ForeverAdded:
Once waves crashed on Mars, over 4 billion years ago water covered the north.
Lowlands, deltas, sediments, the kind only water leaves behind.
Possible shorelines on a planet with no stable seas.
The magnetic field disappeared. Solar wind stripped the atmosphere. The water froze, then escaped into space.
The proof is buried under the dust.
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