Okay, I'm just doing this from memory . . . so I may be completely wrong.
But as I recall, Allan Dean Foster wrote the story for the first Alien movie and the script was based on it. Typically it's the other way around, but not in this case. I think.
Foster published his story as a novel. The novel differs from the movie in some respects, as you might have guessed. It goes into more detail. The script for the film is a condensed version of the story. (Though there were scenes deleted from the film, which I haven't seen yet. Like the cocoon scene. This is in the novel, I believe.)
So . . . if you can find a copy of the novel, maybe there are more backstory details in there.
There might also be a novelization of Aliens, but I'm not aware of it. I only know a novel exsits, based on the first film.
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