In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new dwarf planet. It's called 2017 OF 201, a rock that appears to be some 700 ...

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 ...

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 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 ...

The small distant world called Quaoar, named after a god of creation in Native American mythology, is producing some surprises for astronomers as it orbits beyond Pluto in the frigid outer reaches of ...

A new dwarf planet has been discovered in the icy realms of space beyond Neptune, researchers said Monday. An international team of astronomers spotted the tiny world using the Canada-France-Hawaii ...

For the first time since Pluto was demoted, the idea of a true ninth planet is edging from speculation toward something ...

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 ...

CLEVELAND, Ohio - For Cleveland basketball fans who’ve spent years measuring success through the LeBron James lens, something remarkable is happening: These Cavs are carving out their own identity and ...

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 ...