• April 5, 2012

    Episode 387: Black Hole Clues in Shredded Galaxy

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    The existence of black holes has been known for some time, and it can seem like we know all about them. We know that individual, stellar-size black holes form at the end of a massive star's life. We also know that supermassive black holes exist in the center of galaxies, and it is assumed that they form from the merger of medium-size black holes. Yet these medium-size objects have not been found. Now an x-ray telescope's discovery suggests they do exist. New observations with the Hubble Space Telescope and the SWIFT telescope yield new clues.