That’s the way planets in our solar system orbit. The stars at a galaxy’s outer edge should circle slower than stars near the center. He speculated that some kind of “dark matter” held them together.ĭecades later, astronomers Vera Rubin and Kent Ford found a similar phenomenon when they studied the rotation rates of individual galaxies. The galaxies moved so fast that they should simply fly apart. In the 1930s, Swiss-born astronomer Fritz Zwicky studied images of the roughly 1,000 galaxies that make up the Coma Cluster - and he spotted something funny about their behavior.
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