[zeugma]

It might be an interstellar comet. Then again it might just be a comet that ran into another object in the oort cloud, and had it's trajectory deflected to one that appears interstellar. Of course, that wouldn't get a big headline.

[FYREDEUS]

Sure its not likely that it is interstellar but if it could be proven that a comet was interstellar that could provide a mechanism for Panspermia so would be significant. Proving it is not just “appearance” of interstellar origin is the trick though; more evidence is needed imo.