When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: FX / Hulu "In space," some marketing genius once said, "no one can hear you scream".

That now classic tagline (from Alien, one of the greatest science-fiction horror movies ever made) hinges on a big assumption that most of us broadly make: space is empty. And it is—mostly. But there ...

When you hear that a giant, icy mass hurtling through space has entered our solar system, your mind might leap straight to aliens — and for some scientists, that possibility isn't entirely out of the ...