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, ...

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 ...

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 ...

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 ...

With New Horizons' flyby of Pluto, spacecraft launched by humans have now visited the nine biggest planets (dwarf or otherwise) orbiting the sun. Publications such as the New York Times have called ...

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

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 ...

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 ...

Could there be life in Pluto’s liquid water ocean? If so, the “habitable zones” around distant stars where astronomers look for signs of life must be dramatically larger than anyone thought. If life ...