This theory basically outlines the contradiction between the lack of evidence of aliens, and the high probability that they exist. Devised by Enrico Fermi, he did a series of complex calculations that looked at the probability of life out there, and determined that we should have been visited long ago and many times over.

Basically, there are millions of stars out there, in a galaxy that’s billions of years old, and odd are, there are planets that can support life. Of those planets, some of them must have figured out interstellar travel by now. Then, to follow that logic, some one must have come to see us at some point. Given that we haven’t gotten any visits, there are three conclusions we can draw:

The first is that we’re truly a miracle planet and we are completely alone in the universe.

The second is that we’re first in the universe and it’s up to us to develop the space travel tech over the next million years.

Finally, that we’re not worth the aliens’ attention, so we’re bypassed, an no one talks to us.

Here’s why: