u/02bablobel

Odds are excellent it will be future humans. Because anybody else out there won't be as close to it as future humans.

And they will have forgotten the ancient past when it was launched. I can't see the current mess directly leading to that sort of advanced civilization any time soon.

And the only clue to its origin will be its trajectory and the pictures of humans.

If humans are still human, there will be a mess of silly speculation about it.