Where Are All the Aliens?

by Fraser Cain on June 20, 2013

There are as many as four-hundred billion stars in our galaxy: the Milky Way. And there are more than one-hundred-and-seventy billion galaxies in the observable Universe. Most of those stars have planets, and many of those planets have got to contain useful minerals and fall within their star’s habitable zone where liquid water is present. The conditions for life are probably everywhere. But where are all the aliens? [Read more] ...