LogFAQs > #937439245

Samurontai posted...

Black holes dont just pull everything into them. A star that collapses into a black hole has the same gravitational pull as the star had, iirc.

generally less, in fact, because part of the collapse is a supernova in which the heavy metal core of the star is expelled (and that's how you get planets!)

gravity is proportional to mass and inversely proportional to the square of distance from the origin

supermassive black holes at the center of galaxies are as likely to be the effect of mass concentration around them as the cause of it

in any case, supermassive black holes provide a source of gravity that remains relevant for orbits even at very, very long distances (but their event horizon is a lot shorter). they're far more massive than any star that is capable of existing.

also irregular galaxies don't have supermassive black holes at their center

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