Astonishing facts about the sci-fi classic Alien

“In space, no one can hear you scream!” Nearly 45 years ago, Sir Ridley Scott's 'Alien' burst onto cinema screens - literally! Sigourney Weaver starred as heroine Ripley, who must battle the Xenomorph creature in order to survive. The sci-fi horror classic spawned three sequels, two prequels, spin-off films, video games, comics and an upcoming TV series. But how much do you know about the movie?

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“In space, no one can hear you scream!”

Nearly 45 years ago, Sir Ridley Scott's 'Alien' burst onto cinema screens - literally!

Sigourney Weaver starred as heroine Ripley, who must battle the Xenomorph creature in order to survive.

The sci-fi horror classic spawned three sequels, two prequels, spin-off films, video games, comics and an upcoming TV series.

But how much do you know about the movie?