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i did this research and made my own equation on my own, take our Galaxy for example

1 galaxy=150-350 billion stars

lets take 250 billion stars, and if each star has a solar system of 1 to 9 planets, lets say each star has 5.

5 planets times 250 billion stars = 1,250 billion planets

and if at least 1 in 5 planets has life on it

1/5 X 1,250 billion planets = 250 billion planets

so i think maybe at least 250 billion planets in OUR galaxy have life

but that's only our Galaxy (Milky Way) and in the universe there are billions of galaxies maybe trillions, and how do we know this is the only universe, could there be more?

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15y ago

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Q: What is the Probability theory of life on other planets?
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