Eventually, by growing and consuming material — planets, stars, errant spaceships, other black holes — astronomers think they evolve into the supermassive black holes that they detect at the centers of most major galaxies.
But there’s a twist. Two twists, actually.
First, it would take longer than the universe’s current age for black holes that started as dead stars to grow to galaxy-center-sized black holes. So astronomers also think the universe might have jumpstarted the process by creating giant primordial black holes in the moment just after the Big Bang – though this is just as weird and problematic as you might think.
Second, there’s very little direct evidence of so-called intermediate-mass black holes — the ones in between star-sized and galaxy-sized. Astronomers expect to see some black holes in this middle phase, on their way to becoming supermassive but not quite there yet — and, so far, they mostly don’t.
Both tiny and enormous black holes do exist. We’re just still connecting the dots between them.
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