Barack Obama's insisting the USA doesn't have little green men or alien spaceships locked up in an underground bunker ...

In a world easily startled by sensationalism, Tyson offers a cool, gentle voice of reason amid the unchecked fascination with ...

A physicist has argued that fundamental cosmic constraints make visits from alien civilizations to Earth effectively impossible. Factors such as vast interstellar distances, the speed of light as a ...

Barack Obama Offers Himself as Earth's Future Emissary to Alien Visitors ...