The Fermi Paradox is the apparent contradiction between the high probability for the existence of extraterrestrial civilizations, and the lack of evidence for them.
In a nutshell:
- There are billions of stars in the Milky Way galaxy that are similar to our sun, and many of these are billions of years older than the Solar system.
- With high probability, some of these stars should have Earth-like planets, and if Earth is typical, some should have developed intelligent life.
- Some of these civilizations may have developed interstellar travel, a technology we’re working on right now.
- Even at slower-than-light interstellar travel speeds, the Milky Way galaxy could be completely traversed in only a few million years.
- These figures are only for our galaxy, if you take into account the billions of other galaxies visible to us, the odds of other civilizations existing are even higher.
Given these probabilities, the question is: Where Is Everybody?
This video examines some of the possible answers to this question.