How many planets are there in the universe?

The space is surprisingly large. Our galaxy alone contains about 100 billion stars, and there may be billions of galaxies in the universe. (And a trillion almost it’s definitely bigger than you think it is!) But do we know how many planets are out there?

Astronomers have gone 5,502 planets were discovered about other stars (known as exoplanets) in the Milky Way. Add to our eight solar system (not nine, sorry Pluto), and that gives us a total of 5,510 known planets, all in our galaxy. Counting planets is a difficult task, however, and astronomers are sure there are many more we have yet to discover.

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