Space

One of the most important questions mankind has ever asked may finally have an answer. Are we alone in the universe? Of course, we don't know the complete answer today, but a planetary scientist has a compelling theory about when and where we might - and why we haven't made contact yet. A question asked by physicist Enrico Fermi sums up what has become known as the Fermi Paradox - considering the size and scope of the known universe, and based on humanity's own desperate l