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Stars are first born in Stellar Nebulas. They are left over from old stars the have already exploded and leave dust and gas everywhere.
From there the star ignites, producing heat and light by nuclear fusion within its self. This goes on for many years, depending on its mass.
The star then spends most of its life on the main sequence. Using an H-R diagram you can see the brightness and the temperature of the star.
As the star gets older and older, it begins to get cooler and bigger, starting to expand and becoming a red giant.
When the star runs out of fuel, gravity wins over the star and compresses it so fast that a giant explosion happens. The explosion creates a Stella Nebula where more stars can be made.
After the explosion, the only thing left of the star is its core, and depending on the mass of the star, it can become 1 of three things. A white dwarf, a neutron star, or a black hole.
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