[jerf]

I can't prove it's not an alien probe, no. But I can't prove it's a piece of space debris that just wandered through, either, so why not assume that too?

The problem with "can't disprove" being used as evidence is that you need to consider the full universe of statements that we "can't disprove", but humans tend to think as if "alien probe" is a privileged statement simply because it is cognitively appealing and drives our imagination. If you put it on a list of the things we can't disprove about this particular object, it wouldn't really be the most likely one you'd find.

On the flip side, you also ought to consider the question of all the objects for which we can't disprove they are alien probes. It isn't just this particular object; the solar system is filled with millions of objects we can't disprove are alien space probes, things we've labelled as "asteroids" based on a streak someone took a picture of once. Apply the same standard to all of them that is applied to this object; does it now claim that the solar system is just filled to the brim with alien space probes? Probably not good logic.

Personally, I can't wait until we improve our detection a bit and detect another several dozen things like this object so we can get over this and real science stories can be written about these objects again. Guess this is a taste of what reading about pulsars must have been in the first few years.