By Alvin Alexander. Last updated: June 4, 2016
The black hole in galaxy NGC 4889 is really big. According to this Yahoo story, “The supermassive black hole hidden away in NGC 4889 breaks all kinds of records, even though it is currently classified as dormant.”
It continues: “So how big is it, exactly? Well, according to our best estimates, the supermassive black hole is roughly 21 billion times the size of the Sun, and its event horizon (an area so dense and powerful that light can’t escape its gravity) measures 130 billion kilometers in diameter. That’s about 15 times the diameter of Neptune’s orbit around the Sun, according to scientists at the Hubble Space Telescope.”