There's a mysterious object doing a crazy loop around our solar system,
but scientists have no idea what it is:

"Niku orbits the solar system at a bizarre angle: a plane tilted 110 degrees to
the flat plane of the solar system. This flat plane - a disk in which planets
move around the sun - is a defining quality of a planetary system.

But Niku, already moving above the plane, travels a little further upward every
day.

And unlike the other law-abiding objects in the solar system, Niku travels
against the flow of the bulk of the solar system, taking a wild backward swing
around the sun.

Objects that don't move within the plane of the solar system or spin in the
opposite direction must have been shoved off course by something else or tugged
by the gravity of another object.

"It suggests that there's more going on in the outer solar system than we're
fully aware of," Matthew Holman at the Harvard-Smithsonian Center for
Astrophysics, part of the team that discovered Niku, told New Scientist, where
we first saw the story."

See:

https://amp.businessinsider.com/niku...neptune-2016-8