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

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

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.

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 ...

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

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 ...

Charon is the largest of Pluto’s five moons, stretching at 754 miles (1,214 kilometers) across while the dwarf planet itself measures at 1,400 miles (2,253 km) wide.

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 ...

It's strange orbit means that, for a few years at a time, Pluto's orbit overlaps with Neptune's. This brings Pluto closer to Earth than Neptune, the eighth planet from the sun.

You might be thinking about a giant trilobite found on Pluto, or maybe a dinosaur skeleton on the planet. However, when astronomers use the word "fossil" for ...

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 ...