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Questions on astronomical objects orbiting a star massive enough to be rounded, not massive enough to cause fusion, and which have cleared its orbit of planetesimals.

1 vote
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Could an Earth-sized planet be cold?

; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements. … With that in mind, would it be possible for a planet of Earth's size and age to have a cold core, mantle, and crust? …
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