zombie84 said:
.....The planet is different.
That's for sure. In Alien/Aliens we were on LV426 in Prometheus we're one moon over on LV223. I feel like a broken record on this subject (I've been discussing the flick on another forum), but the events of Prometheus do take place on another moon and that is not the same ship the crew finds in Alien. It's a prequel, but it doesn't set up the events of Alien in the way a traditional prequel would. I don't really see much that would make this an "alternate universe" sort of thing at all.