Historically, stars have been important to
civilizations throughout the world.
They have been part of religious
practices and used for celestial navigation and orientation.
Stars are formed within extended regions
of higher density in the interstellar medium,
although the density is still lower than the inside of an earthly
vacuum chamber.
When stars form in the present
Milky Way galaxy
they are composed of about 71% hydrogen
and 27% helium,
as measured by mass,
with a small fraction of heavier elements.
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