While new discoveries about Mars continue to make headlines, another “red planet”—known as Sedna (or 90377 Sedna)—is making its way into the inner solar system. At this moment, the crimson-hued dwarf ...

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 ...

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 ...

Venture into the extreme outer reaches of the solar system to explore the most distant and enigmatic bodies ever discovered. Meet Sedna, Gong Gong, and Eris as we investigate their strange orbits, ...

More than a decade after an oddball world named Sedna was discovered on the solar system's far frontier, a fresh discovery reveals that it's not so odd after all. Sedna and the newly found object, ...

After years of debate, astronomers worldwide now are planning to settle a question that seems basic to every schoolchild: What is a planet? Prompted by controversy over the status of Sedna — a large ...

Scientists say they have found the first example of a new breed in the solar system's menagerie: a planetoid that spends all its time far beyond Pluto, in a chilly region that was once thought to be ...

New planet hints at possible 'Super Earth' in far reaches of the solar system. Orbit diagram for the outer solar system. The Sun and Terrestrial planets are at the center. The Kuiper Belt (including ...

Mapsof our Solar System may have to be redrawn to include a tenth planet. The object has been named Sedna, after the Inuit goddess of the ocean. It is the largest body orbiting the Sun to be ...