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A Star Orbiting Our Galaxy's Supermassive Black Hole Tests the Limits of Relativity
A Sun-like star orbits the supermassive black hole in our Milky Way so closely that it comes within the distance of Neptune's orbit of the Sun. It has a top speed of more than 8% of light speed. With such extreme motion the star gives astronomers the opportunity to test the limits of general relativity.
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