Why Do Astronomers Believe in Dark Matter?

Why Do Astronomers Believe in Dark Matter?
Carnegie Institution of Washington via AP

Dark matter, by its very nature, is unseen. We cannot observe it with telescopes, and nor have particle physicists had any luck detecting it via experiments.

So why do I and thousands of my colleagues believe most of the universe's mass is made up of dark matter, rather than the conventional matter that comprises stars, planets, and all the other visible objects in our skies?

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