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Hubble Helps Find Smallest Known Galaxy with a Supermassive Black Hole


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Astronomers have found an unlikely object in an improbable place: a monster black hole lurking inside one of the tiniest galaxies known. The dwarf galaxy containing the black hole is the densest galaxy ever seen, cramming 140 million stars within a diameter of about 300 light-years (just 1/500th of our Milky Way galaxy's diameter). However, the black hole inside the galaxy is five times the mass of the black hole at the center of our Milky Way. This suggests that the dwarf galaxy may actually be the stripped remnant of a larger galaxy that was torn apart during a close encounter with a more massive galaxy. The finding implies that there are many other compact galaxies in the universe that contain supermassive black holes.

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      Details
      Last Updated Apr 23, 2025 Editor Andrea Gianopoulos Location NASA Goddard Space Flight Center Contact Media Claire Andreoli
      NASA’s Goddard Space Flight Center
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      claire.andreoli@nasa.gov
      Ray Villard
      Space Telescope Science Institute
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      Related Terms
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      Additional Links
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      ESA Hubble’s Story


      Keep Exploring Discover More Topics From Hubble
      Hubble Space Telescope


      Since its 1990 launch, the Hubble Space Telescope has changed our fundamental understanding of the universe.


      Hubble Science Highlights



      Hubble’s 35th Anniversary



      Hubble Images


      View the full article
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