Recent observations have suggested supermassive black holes formed in the early universe, much earlier than physicists previously thought. This finding leaves little time to account for the growth of supermassive black holes. Physicists know that black holes acquire mass primarily by two means. One way, called accretion, is when matter, mostly dust, falls into black holes. But there's a limit to the speed by which matter can accumulate in black holes through accretion. The second way is through galactic collisions, during which two black holes can merge; however, in the early universe, galaxies were just starting to form. So, physicists have been left wondering how these ancient cosmological wonders grew so massive so quickly. Ultralight dark matter particles could be the missing piece.
