Maybe it's one of the wandering planets that got caught by Suns gravity. I'd imagine there are plenty of those cold bodies between the stars, it would be strang

Maybe it's one of the wandering planets that got caught by Suns gravity. I'd imagine there are plenty of those cold bodies between the stars, it would be strange if solar system didn't encounter any of them. Also the fact that one of them probably even hit the Earth forming Moon makes it even more likely. Maybe Jupiter just "cleaned" our space from them.