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GALACTIC EXTENSION
View larger image | When viewed in wavelengths corresponding to atomic hydrogen gas, the newfound Outer Scutum-Centaurus arm of the Milky Way appears as a tilted band. Astronomers hadn’t spotted the arm until recently because this part of the galactic disk is warped with respect to the middle of the galaxy, like a phonograph record bent by the heat of the sun. Credit: T.M. Dame and P. Thaddeus/Harvard-Smithsonian Center for Astrophysics, Adapted by Stephen Egts

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