One of the biggest questions in the universe is whether or not we are alone. The Fermi Paradox seeks to answer this question and try to make sense of our place amongst the cosmos.
The basis of the paradox is if a civilization had the right rocket technology and the will, they could colonize the galaxy in 10 million years. In the scope of the universe, this is a very short amount of time to colonize a whole galaxy. A study was done from the Kepler Space Telescope that found that one in five sun-like stars have an Earth like planet orbiting them. So, why havent they come here?
There are several “explanations” as to why we haven’t made contact with aliens based off of this statement. The first is because the technology to have feasible space travel does not exist, so colonizing of different planets couldnt happen in the first place. The second is that aliens never had the drive to colonize. Maybe they have the technology, but Earth isnt worth colonizing for some reason. Another explanation is that the intelligent life advanced recently and they just havent come yet. We could be the first advanced life form in the universe and none have developed anywhere else. Lastly, we could have already been visited, maybe when the Earth was still developing, so the aliens overlooked us. (Source) Either way, contact with aliens still has not been done, but we also need to answer the question of whether we want them to come or not?
Bill Nye gives his take on the subject and comes up with a possible solution to this paradox: