For the first time, astronomers have observed a triple collision of galaxies, which have sent their black holes on a collision course, according to a new study
When galaxies collide, so do the supermassive black holes at the center of each galaxy. .
Photos: Wonders of the universeA collision of three galaxies has set three supermassive black holes on a crash course with each other in a system one billion light-years from Earth. Hide Caption 1 of 131 Photos: Wonders of the universe 2I/Borisov is the first interstellar comet observed in our solar system and only the second observed interstellar visitor to our solar system.
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