NASA’s Hubble Space Telescope has measured the largest object in the solar system ever seen since the discovery of Pluto 72 years ago. Approximately half the size of Pluto, the icy world 2002 LM60, ...

A possible ninth planet in our solar system, hovering at its edge, in an artist's illustration. Our understanding of the solar system is a work in progress. Pluto's demotion to a dwarf planet was just ...

Earth has a newly-discovered neighbor in the solar system. But the heavenly body – possibly a dwarf planet à la Pluto – isn't a frequent visitor. Located beyond Neptune, its extreme orbit ...

A Sanjay Limaye, planetary scientist at the Space Science and Engineering Center, University of Wisconsin-Madison: There are many, many objects beyond Pluto, but where they came from and when they ...

CAPE CANAVERAL, Fla. (AP) — A scrawny dwarf planet nicknamed the Goblin has been discovered well beyond Pluto. A round, frozen world just 186 miles (300 kilometers) across, the Goblin was spotted by ...

Scientists have detected methane gas glowing faintly above Makemake, an icy dwarf planet smaller and farther than Pluto in space. Until now, Pluto was the only object that far out in the solar system ...

David Rothery is co-leader of the European Space Agency's Mercury Surface and Composition Working Group, and a Co-Investigator on MIXS (Mercury Imaging X-ray Spectrometer) that is now on its way to ...

LAUREL, Md. (AP) — A tiny, icy world a billion miles beyond Pluto is getting a New Year's Day visitor. NASA's New Horizons spacecraft is set to fly past a mysterious object nicknamed Ultima Thule (TOO ...