                        Astronomy Picture of the Day

    Discover the cosmos! Each day a different image or photograph of our
      fascinating universe is featured, along with a brief explanation
                    written by a professional astronomer.

                                2026 April 3
    Illustration showing a binary black hole close to merger in front of
     the Tarantula Nebula. Please see the explanation for more detailed
                                information.

       Caught in the Web: Visualization of a Black Hole Merger in the
                              Tarantula Nebula
   Illustration Credit & Copyright: Artwork: Carl Knox (OzGrav, Swinburne
                         University of Technology);
   Astrophotography: Blake Estes & Christian Sasse, iTelescope.net; Text:
                Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)

   Explanation: How can we see what is invisible? Black holes are not easy
   to see in the dark cosmic night, but astronomers can find them by
   analyzing their gravitational effects on matter, light and spacetime.
   The featured image shows an illustration that combines a simulation of
   a black hole binary system in its final "death-dance" with an
   astrophotography image of the Tarantula Nebula in the background. Even
   though black holes don't emit light, they distort the path of light
   rays, acting like a gravitational lens. As a result, the nebula appears
   extremely distorted, forming Einstein rings and multiple images.
   Tarantula Nebula lies in the Large Magellanic Cloud, a dwarf galaxy
   that is one of the satellite galaxies of the Milky Way, 160,000
   light-years away. That is more than 1,000 times closer than any of the
   binary black hole mergers detected so far. We'll probably never detect
   a merger so close to home!

                     Tomorrow's picture: pixels in space
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       Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
            NASA Official: Amber Straughn Specific rights apply.
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                           NASA Science Activation
                             & Michigan Tech. U.

