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Dark Matter Might Help Explain How Supermassive Black Holes Can Merge
Astronomers aren't sure what dark matter is, but they carefully observe to determine which models best match the data. Astronomers have recently developed a method to measure the speed of dark matter compared to other objects in the Universe. As a cloud of dark matter moves past a galaxy, gravity pulls particles towards it in a curving trajectory. The speed of the dark matter can be measured through its effects on the galaxy and vice versa.
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