The problem is that astronomers have long posited that galaxies should be evenly split between rotating in one direction or the other, astronomer Dan Weisz from the University of California, Berkeley, who was not involved with the study, wrote for Astronomy back in 2017. “This stems from the idea that we live in an ‘isotropic’ universe, which means that the universe looks roughly the same in every direction. By extension, galaxies shouldn’t have a preferred direction of spin from our perspective,” he added. According to Shamir, there are two strong potential explanations for this discrepancy.

One explanation is that the universe came into existence while in rotation. This theory would support what’s known as black hole cosmology: the hypothesis that our universe exists within a black hole that exists within another parent universe. In other words, black holes create universes within themselves, meaning that the black holes in our own universe also lead to other baby universes.

Another possible explanation involves the Milky Way’s rotation. Due to an effect called the Doppler shift, astronomers expect galaxies rotating opposite to the Milky Way’s motion to appear brighter, which could explain their overrepresentation in telescopic surveys.