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I suppose when their internal cores cool completely and they become termed 'dead planets' like Mars or Mercury. Jupiter and Saturn dont have tectonic activity being mostly gas. But they do have a core. The bigger the planet, the bigger the core mass and the longer it takes to cool..thats the theory.

The question really is..are planets eternal and do they exist until the end of time forever circling a dead cold star in a black solar system until the universe implodes or rips atomically apart?

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13y ago

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