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How many planets are in the galaxy?

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The total number of planets in the universe is unknown, but there are likely many billions, perhaps many with conditions similar to Earth.
More than 300 planets outside our solar system have been discovered. All are within our own Milky Way galaxy, because accurate observations of planet-sized masses in other galaxies is not currently possible. Theoretical extrapolations suggest that there are indeed planets around many stars in other galaxies as well.
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