Time to Take Dark Matter Alternatives Seriously

In 1969, the American astronomer Vera Rubin puzzled over her observations of the sprawling Andromeda Galaxy, the Milky Way's biggest neighbour. As she mapped out the rotating spiral arms of the stars through spectra that she and colleagues had carefully measured at the Kitt Peak National Observatory and the Lowell Observatory, both in Arizona, she noticed something strange: the stars in the galaxy's outskirts seemed to be orbiting far too fast.

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