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Sierra-117- t1_iu1dxy8 wrote

Reply to comment by kozy138 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

Also I realize my comment was confusing. I’m not saying it has a completely cool core, we’re a long way off from that. But it’s core is relatively cool, and therefore volcanic activity has pretty much ceased.

But the crust of a rocky planet gets most of its energy from the star it orbits

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