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Hundreds of thousands of stars in the swirling core of our spiral Milky Way galaxy as seen from NASA’s Spitzer Space Telescope. In visible-light picturesUS astronomers have discovered the biggest black hole orbiting a star 1.8 million light-years from Earth in the constellation Cassiopeia, with a record-setting mass of 24 to 33 times that of our Sun, NASA said Tuesday(AFP/NASA/File)