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Stars are created when a large amount of matter is pulled together by a strong gravitational force. They start off super small like the star in the middle.
After millions or billions of years the star will grow bigger and bigger, slowly moving down the HR diagram.
Once the star begins to reach its biggest size it grows faster and burns the brightest, moving down the HR diagram more quickly until it reaches its maximum size.
After the star reaches its maximum size it slowly starts to get smaller and weaker, sometimes ejecting old matter out into space.
As the star gets smaller and smaller, the gravity gets stronger because there is more and more matter in a smaller space.
When the star can no longer support its own weight it can implode and create a black hole. It has an enormous amount of gravity while being relatively small in size.
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