With the release of Disclosure Day, Steven Spielberg’s new film about aliens, a question as old as science fiction itself resurfaces: if aliens were to arrive on Earth, would they come to conquer us, ...

An international research team led by the University of Vienna has produced, for the first time, high-resolution global maps of invasion risk for thousands of alien plant species under current ...

Add Yahoo as a preferred source to see more of our stories on Google. But the literal meaning of “extraterrestrial” is simply “from outside Earth”. In that broad sense, the only extraterrestrials ...