No, no, I meant like they end the movie without really explaining anything. At all. I mean you can take the plot and make it very basic and push all of that information aside, but then its just a shallow movie.

Its just set within the same universe, but hardly has anything to do with each other. I believe its set 30ish years before the original Alien movie takes place?
The year is 2091 in Prometheus and I think Alien is 2122?