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There is an astronomical number of planets in the universe. We are only now beginning to be able to "see" planets around other stars because of the vast distances that exist between us and them. How many there actually are is anyone's guess.

What we know about galaxies is that the ones we observe contain 200-400 billion stars each. Our solar system contains 8 planets. If we assume each star has 1 planet, and not more, and we average a galaxy to 300 billion stars we can deduce:

The Hubble Deep Field image contains 10,000 galaxies. At 2.5 arcminutes, that's roughly 1/2,000,000 of the visible universe in any direction. So if we multiply 3,000,000,000 x 10,000 x 2,000,000 we get 6 sextillion or 6,000,000,000,000,000,000,000 planets in the visible universe. It is likely much more than that.
Billions certainly, probably billions OF billions. In the last two years since the launch of the Kepler Space Telescope, our "known planet count" has gone from eight to "thousands", and more are discovered every month. It begins to appear that planets are as common as, well, "dirt".

We only _know_ of one universe, THIS one - although there seem to be theoretical reasons why there might be other universes, it seems unlikely that we will ever be able to directly detect them.

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โˆ™ 2013-03-08 17:11:29
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Jessie Jenkins

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โˆ™ 2020-06-07 03:45:50

How many are there in the universe?🤷🏿‍♀️

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Q: How many planets are there in the universe?
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How many planets are there in the whole universe?

700 quintillion planets There are over 700 quintillion planets in the universe โ€” but there's no place like home.


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