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

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

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

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 ...

On Aug. 24, 2006, the International Astronomical Union voted to downgrade Pluto to a dwarf planet, causing controversy both scientifically and culturally.

The feature is called Tombaugh Regio in honor of astronomer Clybe Tombaugh, who discovered Pluto in 1930. But the heart is not all one element, scientists say. And for decades, details on Tombaugh ...

Pluto is also odd in other ways: With its elongated orbit and funky orbital plane, it acts more like other Kuiper Belt objects than traditional planets.

Pluto is the farthest planet, or rather, dwarf planet, away from the sun. It was renamed a dwarf planet in 2006 by the International Astronomical Union because of its size and that other planets may ...

Like a growing number of his colleagues, Brown believes Pluto is best understood as the largest known member of the Kuiper belt, a band of rocky, icy miniplanets that orbit the sun in a swath ...