TheLastForestOnEarth t1_iu1vvbd wrote
Reply to comment by Darkelement in A recently released set of topography maps provides new evidence for an ancient northern ocean on Mars. The maps offer the strongest case yet that the planet once experienced sea-level rise consistent with an extended warm and wet climate, not the harsh, frozen landscape that exists today. by Wagamaga
In Earth's case I believe one hypothesis is that the impact of two planets created Earth and its moon. The incredible heat of our core may simply be left over from this collision.
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