In 2004, astronomers announced the discovery of a red, frigid planet-like body at the outskirts of our solar system. Michael E. Brown, the Caltech astronomer who spotted the object (and who would ...

In the frozen outskirts of the solar system, a reddish dwarf planet orbits in silence. Known as Sedna, it is so distant that one trip around the Sun takes more than 11,000 years. For much of that time ...

Caltech astronomers have discovered the most distant known object in the solar system, a frigid, near-planet-sized body of rock and ice that is now three times as far from the sun as Pluto. The ...

Object 90377 Sedna — a distant trans-Neptunian object known best for its highly elliptical, 11,390-year-long orbit — is currently on its way towards perihelion (its closest approach to the Sun) in ...

Forbes contributors publish independent expert analyses and insights. I am a writer specializing in physics, astronomy, and related topics. The outermost Solar System is a confusing and complicated ...

NEWPORT BEACH, CA (April 24, 2006) - The Binary Research Institute (BRI) has found that orbital characteristics of the recently discovered planetoid, "Sedna", demonstrate the possibility that our sun ...

In 2003, Caltech astronomer Mike Brown and his team discovered a new addition to the solar system: a small icy world called Sedna. It was a bit of an oddball—taking an extremely elongated orbit that ...

A theorized hidden planet screwing with the orbit of distant dwarf planets may really be smaller, more mischievous bits of space debris with a possible link to dinosaurs. Eric Mack has been a CNET ...

Bumper car-like interactions at the edges of our solar system -- and not a mysterious ninth planet -- may explain the dynamics of strange bodies called 'detached objects,' according to a new study.

Bumper car-like interactions at the edges of our solar system—and not a mysterious ninth planet—may explain the dynamics of strange bodies called “detached objects,” according to a new study. CU ...