Before counting the number of stars in the Universe, astronomers count the exact number of galaxies. For that, they make detailed shots of small parts of the sky and count all the visible galaxies.

Scientists concluded that the Universe contains around 2,000,000,000,000 galaxies (2 trillion)

In October 2016, an article in Science suggested that there are about 2 trillion galaxies in the observable universe or about 10 times more galaxies than previously suggested. In an email with Live Science, lead author Christopher Conselice, a professor of astrophysics at the University of Nottingham in the United Kingdom, said there were about 100 million stars in the average galaxy.

When evaluating the size of the Universe, the first difficulty is that it’s unstable, it’s expanding all the time. The second difficulty is that space-time can also bend.

According to some estimates, the mass of the Milky Way is 100 billion solar masses. So, on average, there would be around 100 billion stars in a galaxy. But this number can vary depending on how big the stars are. Besides, according to other opinions, there might be 200 billion stars or even more. And the number of galaxies there are in the Universe can be quite amazing, according to some visualization experiments conducted by the Hubble telescope.

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