After other similar objects were found far away, Pluto was reclassified as a dwarf planet. Photo Credit: NASA Pluto is small- about 1,400 miles wide- and very cold, too cold for life.

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have ...

The first observations of Pluto by NASA's James Webb Space Telescope (JWST) reveal dramatic phenomena on its surface, like ...

Elon Musk, under the username "Kekius Maximus," has joined William Shatner in advocating for Pluto's reclassification as a planet. Shatner playfully suggested Musk persuade the President via ...

Pluto has never been much of a planet — small, wired orbit, not much atmosphere — and questions about its status have been raised periodically since its discovery 76 years ago. This week ...

A legendary actor has taken a surprising turn to the right and is calling on President Trump to make Pluto great again.

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

Pluto was classified as a dwarf planet on August 24, 2006 at the International Astronomy Union (IAU) General Assembly. It was stripped of its planet status, under IAU Resolution 5A, ‘Definition ...

It's an evocative idea that has long bedevilled scientists: a huge and mysterious planet is lurking in the darkness at the ...