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Why do many astrophysicists believe that the universe is full of so-called "dark" matter? What reasons...

Why do many astrophysicists believe that the universe is full of so-called "dark" matter? What reasons are there to believe that this type of matter is very different from "normal" bosonic matter?

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Astrophysicists believe existence of dark matter in universe because of the motion of the stars in galaxies and these stars distribution in the galaxies suggests that there should more invisible mass in and around the galaxy to compensate for the increasing velocity of stars as we move farther from center of galaxy, and this invisible mass is called dark matter ​​​​​​. If this dark matter would not have existed in galaxies stars at the galaxy edge would fly off and no galaxy would have formed but they did so dark matter must exists. Dark matter is different from normal matter, it is invisible, doesn't interact with normal matter and it has only gravity effect on the surrounding where it exists.

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