How Big Are the Biggest Black Holes?

posted by Jason Kottke   May 12, 2023

This short animation from NASA shows the sizes of some of the supermassive black holes that feature at the center of galaxies. Some are relatively small:

First up is 1601+3113, a dwarf galaxy hosting a black hole packed with the mass of 100,000 Suns. The matter is so compressed that even the black hole's shadow is smaller than our Sun.

While others are much larger than the solar system...and this isn't even the biggest one:

At the animation's larger scale lies M87's black hole, now with a updated mass of 5.4 billion Suns. Its shadow is so big that even a beam of light — traveling at 670 million mph (1 billion kph) — would take about two and a half days to cross it.