All code authored by premchai21 on the site Perl Monks (http://www.perlmonks.org) is, unless otherwise noted, public domain. So there.
There is no Extraterrestrial life
There aren't any suitably capable Extraterrestrials
Interstellar travel is too difficult
We're too uncool / not worth the trouble
What do you mean they haven't visited?
Results (520 votes). Check out past polls.