LONDON, April 26 (UPI) -- British theoretical physicist Stephen Hawking says it's likely aliens are somewhere out there in space and humans had best steer clear of them.
Hawking says in a new Discovery Channel documentary to air next month that it seems "perfectly rational" alien beings exist, given the huge number of galaxies in the universe, The Guardian reported Monday. Mostly likely, they are no match for us -- just microorganisms or lower-level animals -- but they also could be intelligent species out to conquer a new world, he says.