Another unknown variable is when exactly did WY pick up on the SJ's beacon?
The way I figure it is that at some time probably a company owned probe or other kind of remote reconnaissance drone intercepted the signal and sent it back to Earth. Exactly when that happened is anyone's guess. Since the Space Jockey was fossilized as Dallas said it's reasonable to assume that signal might have been broadcasting for a very long time. What we don't know is how long it would take for a skeleton to become a fossil on that planet. It might take just a few years or it could take thousands or even longer. From what Lambert said early on in the movie when she was trying to find out where they were is that Zeta II Reticuli was pretty remote and far outside commercial flight paths so it's possible that the signal would have been undiscovered for a very long time just for the simple reason that nobody went there.
Some might raise the question that with all the highly sophisticated listening equipment that we have pointed out into space that how could that signal have gone for who knows how many years and not be discovered? For one, it was necessary for there to be a story, and two the signal might have been weak enough that it was only short range and it broke up so much that it just sounded like background noise that computers were programmed to ignore. At least that's the way I figure it.
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