Earth" brought a shipload of xenomorphs and other space horrors, but hybrids may be the biggest mystery of the show so far.

Earth is dotted with humongous, human-made structures that, to an alien eye, may be tell-tale signs of intelligent goings-on.

Experience the peaceful sounds of nature at Smith Rock State Park. The trails pass through cliffs, riverbanks, and open ...

"Each interstellar comet brings a little bit of its history, its fossils, from elsewhere." ...