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A star is born in a molecular cloud. The molecular clouds are the remains of a star that previously died.
A star is born because the gravity inside clouds is so strong that it pulls materials from the previous star together to make a new star.
A star goes through its life by consuming hydrogen and turning it into helium. As shown on an HR graph, it's temperature and brightness will slowly increase as it ages.
As the star goes into to its last stage of life, it runs out of fuel and becomes a red giant. This is the part of the star's life where it peals off of the main sequence of an HR graph as it becomes drastically brighter and cooler.
Finally after the star runs out of fuel it will explode. This is the part where the star disappears off the HR graph.
Some times if the star is large enough and the gravity is strong enough all the materials and makeup of the star will pull into each other until it becomes a black hole.
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