The enormous black holes that lurk at the hearts of all galaxies are significantly bigger than astronomers had imagined, a new study suggests.
Researchers have used a new method to measure the distance to the active spiral galaxy NGC 4151 — whose core is dubbed the “Eye of Sauron” because of its resemblance to the structure in the “Lord of the Rings” films — with unprecedented precision. This calculation enabled them to determine the mass of NGC 4151’s central black hole more accurately — and the results were surprising.

This is an excerpt from Space.com, you can read the full article at this link