Merging Black Holes

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a black hole in the middle of a galaxy with stars
they are caused by violent cosmic phenomena such as merging black holes and exploding stars courtesy chris henze / nasa
    a painting of a circle of fire with two holes in the middle
    a drawing of a robot holding a piece of wood
    a black background with a red and blue swirl in the middle
    an illustration of two merging black holes is shown on a black background
      a green cartoon character with a purple eye is standing next to a black circle
      a drawing of a monster with the letter s on the bottom
      a person 's arm is shown in a blurry photo with a black background .