The debate over Pluto’s planetary status has been ongoing since its reclassification as a “dwarf planet” in 2006 by the ...

Pluto, once considered the ninth planet of our solar system, has been a topic of intrigue since its reclassification as a ...

On Aug. 24, 2006, the International Astronomical Union (IAU) decided that Pluto wasn't a planet anymore. Instead, Pluto is ...

New Horizons studied Pluto in depth for only a few hours, although it continued to observe the dwarf planet for months before ...

On August 24, 2006, Pluto ceased to be considered a planet. A mixture of rock and ice located in the Kuiper Belt, a region of icy objects beyond the orbit of Neptune. This demotion ...

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 ...

Pluto and its moon Charon may have been briefly locked together in a cosmic “kiss”, before the dwarf planet released the smaller body and recaptured it in its orbit.

New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

Dean chats with Mike Brown, the so-called "killer of Pluto," about why Pluto was demoted from planet status and how people have reacted to the change. And about a new planet that might take it's ...

The findings don’t stop at Pluto and Charon; they may help explain the origins of other massive icy bodies beyond Neptune’s orbit. “This clear link between progenitors and the present bodies ...

And once-mighty Pluto, named for that Roman god of the underworld, wouldn't even be the only "pluton." Under the new definition -- spherical bodies of a certain mass -- Pluto would have to hang ...