Is this a problem?

centrosphere
MemberOvomorphMay 31, 2012792 Views3 RepliesWe already know, due to Shaw making radiocarbon dating of the Engineers corpses, that they were preparing to come to Earth and wipe us two thousand years ago.
But...
At the initial briefing that Shaw and Holloway do at the beggining of the movie, they show a lot of ancient artifacts that display the same picture, the set of five celestial bodies. If you go check them, most of them are dated into the range of BCE, or "before common era", before Christ. But one of them shows a different dating, "680 CW", and not BCE:
[img]http://img198.imageshack.us/img198/1176/artifact7.gif[/img]
If this CW means "after Christ" or Common Era, we are in trouble, because it is proof that the Engineers were here on Earth again many centuries after the time they apparently wanted to destroy us.
Any ideas?