Volcanism...I knew those pointy eared, green blooded hob goblins had ill intent! Oh, wait...

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I think it's pretty likely that the majority of planetary bodies throughout the universe which have hosted life have done so for a comparably short period of time. Worlds like our Earth where life persists for several billions of years and develops into advanced multi-cellular life are probably fairly rare. Though on the other hand, there are so many stars and planets even in a single galaxy that there may be many such worlds in the Milky Way even if they make up a tiny percentage.