Stars
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- Stars are the most basic unit of mass that is produced when gravity pulls mass together
- Stars are in a state of equilibrium. The force of fusion equally matches the force of gravity. When stars run out of fuel, fusion slows and stops, and gravity wins.
- Dark matter is not in the gravitation field of galaxies. Galaxies are suspended in the gravitational field of dark matter.
- Red dwarfs are the most popular types of stars, but are not visible to us. Blue stars are very rare, but hot and large enough for their light to reach us.