You mean planet X I guess, there's evidence for it based on the way other objects are having their orbits affected, but we haven't actually observed it. Sounds kind of funny to say, but there's a lot of dust in that part of space, it's hard to see anything there.
use_value42 t1_jd56gaq wrote
Reply to Is there another massive planet beyond Neptune? If so, why haven’t we found it? by Always2ndB3ST
You mean planet X I guess, there's evidence for it based on the way other objects are having their orbits affected, but we haven't actually observed it. Sounds kind of funny to say, but there's a lot of dust in that part of space, it's hard to see anything there.