C4-BlueCat t1_iu3ptya wrote on October 28, 2022 at 9:54 AM

Reply to comment by jackfrost7890 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

Doesn’t explain Venus though - that one used to have an earth-like climate before its runaway greenhouse process

jackfrost7890 t1_iu78o06 wrote on October 29, 2022 at 2:12 AM

Same theory but seems even more possible considering how much everyone is talking about greenhouse gases and climate change. They say there is alot of methane trapped in the ice caps. And methane is more insulating then carbon.