Well, as I'm arguing, Earth in Mario is infinite alone because it contains the said infinite world, and as the comet observatory can move past World 1, which contains Earth, all the way to the center of the universe, it should logically have traversed infinite distance. Are you essentially saying that using this argument wouldn't work because it's basically an outlier? If so, then I disagree because for one, there are far more other feats where characters traverse at least out of Earth. Heck, Mario does this every game. So I don't see how can this be inconsistent.