How long does a star live?

A star glows for millions of years until the
gases in its outer layer begin to cool, and the
hydrogen in the inner core is slowly used up.
The cool outer layer starts to glow red. When
this happens the star is called a red giant. The
red giant continues to lose its brightness until
it fades away. Depending on its size, a red
giant may die in an explosion, get compressed
to form a black hole or become a white dwarf.

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