Extraterrestrials have been discussed for many years. There were eyewitnesses and skeptics. People claim they were abducted while others claim they were lucid dreams. There have probably never been ETs here on Earth, probably not even in the solar system. This does not mean, however, that they do not exist at all. If scientists are right, no extraterrestrials have ever been to our planet. This raises one of the most problematic questions posed by SETI. Where are they? Why didn't they come to our planet, even if it were to colonize it and enslave us? They should have arrived by now. There are many solutions to this paradox, first thought of by Enrico Fermi. One is that we are alone, one of the most implausible theories that science has ever seriously considered. All the evidence says they are somewhere in our universe, but we don't know where. The Fermi paradox has been the biggest problem for SETI. Why aren't they here? If they are advanced enough to send radio signals, they should probably be more advanced than us. There...