Prometheus

Hi guys I checked out Prometheus last night in 3D and I loved it!!! The effects and atmosphere were awesome but I did leave with many questions still unanswered. Such questions are. How did the derelict get on to LV426 as Prometheus was set on a different planet ? What happens to Shaw and David? Why are the creature's in Prometheus so sufferer from the Aliens on Aliens??? Why are the engineers smaller in Prometheus than they appear in Alien? So many questions to answer still??? But I totally loved this movie, a real treat enjoy !!!!!!!