How Confident Are We That Dark Matter Is Real?

How Confident Are We That Dark Matter Is Real?
Carnegie Institution of Washington via AP

In the 1970s astronomer Vera Rubin was observing the Andromeda galaxy and discovered something very curious. Andromeda is a spiral galaxy, like our own, and spins like a pinwheel. The “spinning” is comprised of all the individual stars (and gas and dust, but the stars are what we can see) revolving around all the mass within their orbit.

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