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This artist's impression released by the European Southern Observatory (ESO) shows how Mars may have looked like about four billion years ago. The young planet would have had enough water to cover its entire surface in a liquid layer (Oceanus Borealis according to the ocean theory).

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This is the English translation of the Media of the day description page from 26 October 2024.

Descriptions in other languages:

• Motd/2024-10-26 (en)