Black holes form when mass gets crammed into
such a small volume that no force can hold up the
mass against gravity's pull. This happens in
the interiors of massive stars as they die, and
apparently in other ways as well as most galaxies
contain massive black holes at their centers.
I'm not sure we know how these supermassive
black holes form, although we can model it
using computer simulations. Normally, when you
compress gas and dust, you get stars, not black
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