What is the probability of alien life in the universe?

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Gonna give this a go, please correct me if my math is off. I will be typing out these gigantic numbers for dramatic effect, because yes i am aware of scientific notation.

It is estimated that there is a trillion billion stars in the observable universe, thats 1,000,000,000,000,000,000,000.

It is also estimated that there are 21.6 sextillion planets in the observable universe. That's 21,600,000,000,000,000,000,000,000.

Lets assume out of 21.6 sextillion planets .01% have some form of life, intelligent or not. That comes to 21,600,000,000,000,000,000, or twenty one quintillion and six hundred quadrillion planets in where some form of life exists.

Of that 21.6 quintillion where some form of life exists, lets assume further that .001% of those planets contains some form of intelligent life equal to that of Earth's. That equates to 21,600,000,000,000,000 or twenty one quadrillion and six hundred trillion planets that contain life with an intelligence equal to that of Earth's.

Furthermore, lets assume of that 21.6 quadrillion .0001% of those planets contain a form of life capable of interstellar travel. That comes to 2,160,000,000,000 or 2.16 trillion planets with life capable of interstellar travel.

Tl;dr, we are not alone in the universe. In fact its teeming with life, and odds are we've been visited by multiple alien species.

submitted by /u/silverwarewolf
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source https://www.reddit.com/r/UFOs/comments/pblqmd/what_is_the_probability_of_alien_life_in_the/

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