Clues to another world's existence

Clustering of objects

A dozen objects in the outer Solar System seem to be clustered together, with their closest points to the Sun all being fairly similar. This suggests there is a large unseen mass – a planet – shepherding their orbits. The same side

Not only do those 12 objects have a similar perihelion, but they are also all grouped on one side of the Sun. Again, this suggests there is something out there pulling them in that direction.

The wrong way

Some objects in the outer Solar System appear to be orbiting in the opposite direction to everything else, perhaps being pulled into these extremely elliptical orbits by Planet Nine.

The missing super-Earth

Many other planetary systems we’ve found in our galaxy contain a superEarth. Could Planet Nine be the missing planet from our Solar System that’s common almost everywhere else?