Quote:
Originally Posted by pylon
And to answer your question, the Space Jockey was some fossilized relic they found at the beginning of Alien, and a crashed alien ship that had sent out a warning signal to avoid the planet because of the Xenomorphs (aliens).
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To add, he (the fossil) was a humanoid (though about twice the size) that had evidence foreshadowing the alien species gestating in the belly and bursting out.
Also he looked like he grew into or out of his seat (hence the designation 'space jockey' by those in the know and the fans, though never used in the movie). He was basically one of H.R. Giger's creations, very typical of his work. I don't think they ever planned to explain the nature of that species, and why they looked like they kinda existed as part of a (an organic?) machine, it was just Giger doing his awesome creepy artwork.