Triple star systems are very common in the universe, but now astronomers have found a system where one of the stars is a black hole. They're located in the V404 Cygni system, about 8,000 light-years away. At the center is a black hole consuming a small star, while a third star is orbiting the black hole every 70,000 years or so. Astronomers had spotted this third star a long time ago, but only recently discovered that it's part of the system thanks to Gaia.


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Source: The First Triple Star System Found Containing a Black Hole