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 Originally Posted by OngBonga
Also, since we're being pedants, we can't actually be certain that the sun is the only star in the solar system. While there is no evidence of such things existing, there's also no way we can be certain that relic black holes do not exist... that is, black holes that are almost fully evaporated, but cannot evaporate further. This could be dark matter. Given our best understanding of black holes is that they are the end state of massive stars, I can argue that there could be a ludicrous number of "stars" in the solar system for all we know.
There is some hypothesis that the sun may have a binary partner way out past the orbit of Pluto. It would be a very distant, cold, and dark object to have gone undetected for so many decades (centuries?) without being positively identified. It could be a Jupiter-sized planet, a slightly larger object called a "failed star" which is either just not quite big enough to start its own fusion, or is too rich in non-Hydrogen elements to achieve the pressure needed to fuse whatever it's made of. It could be a tiny black hole.
The evidence for "some" object being out there is slim, but not so slim as to ignore. It's just not 100% required for the data to be explained by a single errant object in the outer solar system. It could be, but it could also be a bunch of random events with smaller objects that statistically just happen to look like maybe there's 1 big thing out there causing it.
Good point, though, that we don't know for certain that there's only 1 star in the solar system.
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