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 ...

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, ...

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 ...

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, ...

Add articles to your saved list and come back to them any time. Earth, Mars, Jupiter, Venus... and now Sedna? Astronomers announced yesterday they had found the most distant planet-like object in the ...

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've found a pink dwarf planet that travels farther from the sun than anything ever seen. Its discovery has led to tantalizing hints that a separate, unknown planet bigger than the ...

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 ...