Astronomers discover massive black holes in earth's 'backyar

The two black holes were discovered by studying the movement of their companion stars. A strange 'wobble' in the movement of the stars in the sky indicated that they are orbiting a very massive object.

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Germany , Heidelberg , Baden Wüberg , Kareem El Badry , Timo Prusti , Max Planck Institute For Astronomy , Harvard Smithsonian Center , European Space Agency , Max Planck Institute , Black Hole , Lack Hole Near Earth , New Black Hole , Sa , Space Agency ,