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

Pluto has never been much of a planet — small, wired orbit, not much atmosphere — and questions about its status have been ... called planets without any debate." Levy, science editor for ...

Although three times smaller than Pluto, researchers say 'Planet Nine' is still big enough to be considered a dwarf planet ...

“We should ask Elon to get the President to sign one of those Executive thingies to make Pluto a planet ... subject of much debate. One thing is clear, however: Pluto’s status is not ...

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.

A US-based trio hunting this elusive world has stumbled on what appears to be a new dwarf planet in the solar system's outer ...

Some astronomers say the strange, clustered orbits of icy rocks beyond Neptune indicate that something big is out there, ...