Sorry, but I've already retconned this film into the AVP timeline. Speaking of timelines, I have a question; If Prometheus takes place 30 years before Alien, could Ridley be changing the year Alien occurs in and make it 30 years after 2023 instead?
EDIT: Ridley did say earlier that he didn't make a specific time date for Alien so that the timeframe could be changed to match up with reality.