Astronomers have hoped for the existence of Planet Nine for years. Things were looking promising, but this discovery might ...

The Subaru telescope located at the Mauna Kea Observatory on Hawai'i has found a new world within our Solar System, dubbed ...

Despite the powerful telescopes that modern astronomers have to work with, the distant reaches of the Solar System are still ...

Ammonite was discovered using the Subaru Telescope in Hawaii, with follow-up confirmation from the Canada-France-Hawaii ...

The two researchers first inferred the possible existence of Planet Nine back in 2014, after analyzing the highly elliptical orbits of the dwarf planet Sedna and a new object they spotted, known ...

Scientists say they've found a pink dwarf planet that travels farther from the sun than anything ever seen.//PI says we can't call it the most distant object because right now, Sedna is more ...

After Sedna Discovery, Defining What Makes a Planet NPR's Madeleine Brand talks with NPR's Ira ... about this week's announcement of the discovery of a new "planetoid" astronomers have dubbed Sedna.

Rather, the new planet might have accreted closer in like the other planets, and then been ejected by their gravitational forces. “Planet 9 is part of the sun’s family,” says Brown.

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.

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 ...