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During a clash of galactic clusters, NASA’s Chandra X-ray Observatory and Hubble Space Telescope teamed up to produce this composite image, which shows clear evidence for dark matter. With Hubble, astronomers inferred where the dark matter, shown in blue, sits. Chandra mapped the locale of ordinary matter, mostly hot gas, shown in pink. The image reveals that as the two clusters collided, the dark matter sailed right through the normal matter. The find supports the notion that dark-matter particles interact with each other and normal matter weakly, if at all, aside from the pull of gravity.
