mystery TNOs
They have to be pretty small and pretty far away from Neptune.
The many TNOs found since the 90s and 2000s are very small, Pluto-like, with very eccentric orbits and satellites in some cases. More recent finds are more like Ceres.
X marks the... They SAID there was a mystery planet there – NASA
However, despite finding thousands of new stars in its survey of the sky, WISE was unable to spot any object the size of Saturn or larger to a distance of 10,000 astronomical units (1.49597871 × 1015m, or 9.29558073 × 1011 miles) and nothing bigger than Jupiter out to 26,000 AU.
Biting the hand that feeds IT
