The exact number of galaxies in the universe is difficult to determine due to its vast size and the limitations of current observational technology. However, astronomers estimate that there are billions or even trillions of galaxies in the observable universe.
The observable universe refers to the portion of the universe that we can currently observe and study. It extends as far as light has had time to reach us since the Big Bang, which is approximately 13.8 billion light-years in radius. Beyond that, the universe may continue to extend, but we cannot observe objects or structures located beyond that distance.
Within the observable universe, astronomers have made estimates based on observations and measurements from various telescopes and surveys. These estimates suggest that there are anywhere from 100 billion to 200 billion galaxies in the observable universe.
It's worth noting that these estimates are subject to revision as our observational technology improves and our understanding of the universe expands. With advancements in telescopes and data analysis techniques, future studies may provide more accurate estimates of the total number of galaxies in the universe.