The Solar System has a new most-distant member, bringing its outer frontier into focus. New work reports the discovery of a distant dwarf planet, called 2012 VP113, which was found beyond the known ...

Sedna is drifting into a part of its path where human technology can finally contemplate catching up, and that window will ...

Astronomers announced Monday they had discovered the most distant object ever detected in the solar system -- a fiercely cold object neither planet nor comet, but a mysterious fossil remnant of a time ...

Astronomers searching for the faintest glimmers of light beyond distant Pluto say they’ve discovered a new dwarf planet – and that this planetoid’s movements hint that an invisible giant planet ...

Persistent Evidence of a Jovian Mass Solar Companion in the Oort Cloud, 41 pages) (H/T Centauri Dreams) We present an updated dynamical and statistical analysis of outer Oort cloud cometary evidence ...

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 ...

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, ...

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 ...

A newly found object may set a new record for the most distant dwarf planet in the solar system. The object, called V774104, lies about nine and a half billion miles from the sun, or two to three ...

Astronomers searching for the faintest glimmers of light beyond distant Pluto say they’ve discovered a new dwarf planet – and that this planetoid’s movements hint that an invisible giant planet ...