How many planets are in the universe?


Space is mind-bogglingly big. Our galaxy alone has around 100 billion stars, and there could be trillions of galaxies in the universe. (And a trillion is almost definitely larger than you think it is!) But do we know how many planets are out there?

Astronomers have discovered 5,502 planets around other stars (known as exoplanets) in the Milky Way. Add in the eight in our solar system (not nine, sorry Pluto), and that gives us a total of 5,510 known planets, all located in our own galaxy. Counting planets is a hard task, though, and astronomers are certain there are many more out there we haven’t found yet.


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