As Ross said, the nearest black hole is really REALLY far away. According to Universe Today though, it seems like the nearest black hole is 3,000 light years away. It’s known as V616 Mon and has between 9-13 times the mass of the Sun. The one that is in the middle of our own Milky Way galaxy is a ‘super massive black hole’, which is located about 27,000 light-years away.
The closest black hole we know of is a stellar mass black hole called V616 Monocerotis, also known as V616 Mon. It’s located about 3,000 light years away, and has between 9-13 times the mass of the Sun. The one that was recently imaged is a supermassive black hole in the centre of Messier 87 (M87), an elliptical galaxy some 55 million light-years from Earth. This black hole is 6.5 billion times the mass of the Sun. You can see the image here: https://exoplanets.nasa.gov/news/1566/black-hole-image-makes-history-nasa-telescopes-coordinated-observations/
As the others have said, it’s really far away – 3,000 light years. But in the context of the universe, it’s actually quite close! In memory of Stephen Hawking, a signal was sent to this black hole but it will take 3,457 years to get there! Who knows what state humanity and the Earth will be in in 5475!?
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