Supermassive Blackholes

"Most known black holes are either extremely massive, like the supermassive black holes that lie at the cores of large galaxies, or relatively lightweight, with a mass of under 100 times that of the Sun. Intermediate-mass black holes (IMBHs) are scarce, however, and are considered rare "missing links" in black hole evolution."

https://science.nasa.gov/missions/hubble/nasas-hubble-finds-strong-evidence-for-intermediate-mass-black-hole-in-omega-centauri/?utm_source=join1440&utm_medium=email&utm_placement=newsletter