The Classification of Stars
This diagram shows most of the major types of stars there are. The vast
majority of stars are main sequence stars - these are star like the Sun that
are burning hydrogen into helium to produce their energy. Most stars spend
90% of their life as main sequence stars. When stars exhaust their hydrogen
fuel the outer layers of the star can expand greatly and the star becomes a
giant. This only lasts a few million years before the star throws off its
outer layers revealing a degenerate core, or in extreme cases a black hole.
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