I enjoed ???Prometheus???

I've been wanting just that sort of detective work, analyzing the trailer's and other footage. Yet I think we're limited by a lot of information being kept from us. Ridley says this picture is epic what I've seen so far, while fascinating, doesn't seem THAT epic to me. So, I believe we'll be blown away when we see the whole film. I also read thatin the beginning of the film we discover, on earth, that earth has been visited and they left a star-chart showing the way to where they came from - correct?