6 billion years old and home to more than 100 billion stars. This reality suggests there is likely a mind-boggling number of ...

While idea may violate Occam’s razor, “it remains a speculative but logically open alternative,” says biologist Robert Endres ...

Survival of the fittest. Nature red in tooth and claw. The common view of natural selection is based solely on the individual: A trait allows an organism to out-compete its rivals and is thus passed ...

Astronomers may finally understand why planets orbiting two suns, the real-world equivalents of the "Star Wars" planet ...

Now we have the opposite problem: Obama says UFOs are real and the world shrugs.