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Stars are born in dense molecular clouds that are composed of gas and dust. These clouds are called stellar nurseries.
Gravity then pulls particles together to form clumps that over time continue to get larger and larger. If they become large enough, the pressure will generate heat.
Next nuclear fusion occurs and gravity brings hydrogen atoms together to fuse them into helium atoms. This reaction provides the energy that allows the star to ignite.
A star then begins its main sequence which lasts for the majority of the star's life. What occurs after this is determined by the star's mass. Our sun and other mid-sized stars become white dwarfs.
Once the star uses up its hydrogen core it expands and cools becoming a red giant. Eventually, it expands so much that it causes the objects around it to explode. Then it collapses under gravity and sheds its outer layers forming a planetary nebula.
Other stars die by collapsing rapidly and exploding into supernovas.
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