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, ...

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 ...

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 ...

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 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 ...

TUCSON, Ariz. — It's the farthest destination in the history of human exploration. “If you measure things by size of the earth's orbit call that one, Neptune is about 30, Pluto is like 33, Ultima ...

LAUREL, Md. (AP) - NASA's New Horizons spacecraft has survived humanity's most distant exploration of another world. Ten hours after the middle-of-the-night encounter 4 billion miles (6.4 billion ...

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 ...

NASA's New Horizons spacecraft has survived humanity's most distant exploration of another world. Ten hours after the middle-of-the-night encounter 4 billion miles (6.4 billion kilometers) away, ...