Sedna was not the only object close to Pluto's size to be discovered in the early 2000s. Brown's team also found Quaoar, another dwarf planet candidate, and Eris. Eris was initially thought to be ...

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 planet is making its closest approach to the Sun in ...

The dwarf planet Sedna, discovered in 2003, has an incredibly eccentric orbit, such that it can be anywhere between 76 AU and about 940 AU from the sun. Last year, Sheppard and Trujillo discovered ...

The newfound celestial body, called 2012 VP113, joins the dwarf planet Sedna as a confirmed resident of a far-flung and largely unexplored region scientists call the "inner Oort Cloud." ...

Roughly 600 miles wide, Sedna is big enough to qualify as a dwarf planet. So scientists were puzzled: Was Sedna a freakish one-off, or was it part of a population of rocky bodies in that ...

The presence of Eris helped scientists determine that Pluto should not be counted among the major planets. Sedna, a dwarf planet that Trujillo co-discovered as well in 2004, is located in the same ...

Even though 2012 VP113 is the new guy on the block, it's not alone. Its closest neighbor is Sedna, another dwarf planet that exists past the Kuiper Belt, approximately 4 billion miles from the sun.

The only known body in that no-man's land is the dwarf planet Sedna. Found in 2003, it's twice as far from the sun as any other object detected in the solar system. A decade later, researchers ...

Sponsor Message Until now, the only object detected in that part of our solar system was a dwarf planet called Sedna, after an Inuit goddess said to live in the frigid Arctic Ocean. That discovery ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

The presence of Eris helped scientists determine that Pluto should not be counted among the major planets. Sedna, a dwarf planet that Trujillo co-discovered as well in 2004, is located in the same ...