Rise of the dwarf planets. 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.

For reference, Pluto’s average distance from the Sun is about 40 AU, so 2023 KQ14 is quite distant. At 23.4 billion miles (37 ...

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 ...

Sedna – a distant dwarf planet 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 2076.

Sedna is a mysterious planet-like body three times farther from Earth than Neptune—and a spacecraft can get there in 20 years if it leaves in 2029. Newsletters Games Share a News Tip.

With 2012 VP113's discovery, Sheppard is confident that there are more planet-like objects out there. "Sedna and VP113 are just the tip of the iceberg," he said.

After Sedna Discovery, Defining What Makes a Planet NPR's Madeleine Brand talks with NPR's Ira Flatow, host of Talk of the Nation Science Friday, ...

The quest to find hidden worlds. Searching for planets lurking in the frigid edges of our solar system is not a new concept. The so-called Planet Nine, a world 10 times more massive than Earth, is ...