As recently as a hundred years ago, astronomers thought the entire universe was contained in the Milky Way. But then Edwin Hubble figured out how to measure the distance of faraway objects. Suddenly, we learned that many smudges in the night sky weren’t within our galaxy at all – they were actually other galaxies outside our own! Today, astronomers suspect that the universe contains about 200 billion other galaxies. However, that figure is unlikely to be reliable. Subsequent sensitive observations found that many faint galaxies were not observed the first time. The most recent, and likely the most accurate, survey found that the real number of galaxies is ten times larger: so, in total, there are 2 trillion galaxies in the universe, or 2,000 billion, if you prefer.
Picture Credit : Google