Of all the various subgenres attached to the sci-fi domain, alien invasion flicks come off as timeless favorites. Here are five of the very best.

Add Yahoo as a preferred source to see more of our stories on Google. The spaceship in "District 9" is pictured. - Sony Pictures Releasing It's a big universe out there, and while we're all for ...

We may receive a commission on purchases made from links. Are we alone in the universe? It's a huge question with no easy answer. And, following on from that, if we aren't alone, what would beings ...