Sorry, gravity is a bit mysterious and scientists are still trying to fully understand it. They are searching for a “gravity particle” that will form part of a so called “Grand unified theory” that will fully explain how the university works.
In broad terms, if something rotates and is heavy (say, for instance the earth!) it will exert a gravitational force and pull things towards it. Other rotating objects will also exert a pull which is why all matter in the universe doesn’t end up colliding with the earth.
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