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CNN
cnn.com
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Mars may have once had an ocean so vast that it covered one-third of the planet before evaporating billions of years ago and leaving behind a telltale sign: a flat band of land, outlining the former ocean — similar to the ring left behind in a drained bathtub. https://cnn.it/4mJFjHF
2026-04-20T21:03:03.550Z