Two galaxies on collision course.
Observations with NASA’s Chandra X-ray observatory have disclosed two giant black holes inside NGC 6240. They will drift toward one another and eventually merge into a larger black hole.
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Credit: NASA, ESA, the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University).