At least there 10 times more galaxies in the observable universe of what was thought, according to the opinion of a team of astronomers who has analyzed a deep sky census mounted from surveys conducted by the Hubble Space Telescope and other observatories.
When analyzing the data, the team, led by Christopher Conselice, from the University of Nottingham, discovered that most of these new galaxies were relatively small and weak, with masses similar to those of the satellite galaxies surrounding the Milky Way. As they merged to form larger galaxies, the population density of galaxies in space decreased.
How many galaxies are there?
Until now it was estimated that the total number of galaxies in the observable universe contained about 100,000 and 200,000 million galaxies. In light of this new count, we must estimate that there are between 1,000 and 2,000 billion galaxies, which means there are about 700 quadrillion stars.
So, according to this study that will be published in The Astrophysical Journal, galaxies are not uniformly distributed throughout the history of the universe, as it points out Conselice:
These results are powerful evidence that a significant evolution of galaxies has taken place throughout the history of the universe, which drastically reduced the number of galaxies through mergers between them. The reduction of its total number gives us a verification of the so-called up-down formation of the structure in the universe. (...) It is amazing that more than 90 percent of the galaxies in the universe have not yet been studied. Who knows what interesting properties we will find when we discover these galaxies with future generations of telescopes? In the near future, the James Webb space telescope will be able to study these ultra-weak galaxies