The most common way for a black hole to form is
probably in a supernova, an exploding star. When a star
with about 25 times the mass of the Sun ends its life, it
explodes. The outer part of the star screams outward
at high speed, but the inner part of the star, its core,
collapses down. If there is enough mass, the gravity of
the collapsing core will compress it so much that it can
become a black hole. When it’s all over, the black hole
will have a few times the mass of the Sun. This is called
a “stellar-mass black hole”, what many astronomers
think of as a “regular” black hole.
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