Astrophysicists propose that black holes exist in a hierarchical structure, ranging from stellar mass black holes formed from collapsing stars to supermassive black holes (SMBH) found at the centers of galaxies, including our Milky Way.
The existence of intermediate mass black holes remains uncertain, and researchers are exploring innovative methods to detect them.
One promising approach involves utilizing microlensing fast radio bursts, which may provide insights into these elusive black holes.