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.
Beberapa tahun lalu, ahli fisika Enrico Ferni mempertanyakan, berhubung alam semesta sudah lama ada, dan kita berharap ada banyak planet lain di dalamnya, seharusnya kita sudah menemukan bukti keberadaan alien sekarang.