Many years ago, the physicist Enrico Fermi asked that, given the fact that our universe has been around for a very long time and we expect that there are many planets within it, we should have found evidence for alien life by now.
Aastaid tagasi küsis füüsik Enrico Fermi, et kas arvestades, et meie universum  on olnud olemas juba väga-väga kaua ja seda, et selles on väga palju planeete, poleks me pidanud praeguseks juba leidma tõendeid maavälise elu kohta?