How could we defend Earth against an alien Invasion? Do we even stand a chance? Could the United States, Russia and China ...

A Harvard University astrophysicist has sparked a furious debate by warning he cannot rule out that extraterrestrials are ...

When you hear that a giant, icy mass hurtling through space has entered our solar system, your mind might leap straight to ...

We've all grown up dreaming of aliens landing on the Earth or laser beaming across the sky; well, either way, it's sci-fi and ...