astronomy

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Four Galaxies Share a Destructive Dance

These are the galaxies of Hickson Compact Group 87, about 400 million light years from Earth, as seen from the mountains of Chile. Just as the planets of our solar system orbit the Sun, and all the stars in our galaxy orbit the galaxy’s centre, the galaxies of groups like HCG 87 orbit a common centre of gravity – creating a kind of cosmic, balletic dance. Read more >>