https://iopscience.iop.org/article/10.3847/1538-3881/aceaf0
Japanese research suggests there is an object in our solar system 1.5 - 3 x the mass of Earth. From what I gather it is located about 750 billion kilometers from Earth.
Computermodels have indicated as such by the behavior of its surroundings.
Don't think I'll make that if I want to drive there and see it but still, the fact people research this and come up with such results boggles the mind.
Another Planet X (or Planet 9) Contender.
I'll finally believe when I see :) But of course, there is much more out there than we know.
If it's orbiting the Sun then it's about 5 times the distance from the Sun than Earth is - must be a cold place, not very "Earth-like".