One Pluto year equals 248 Earth years. At 1473 miles in diameter—about half the width of the United States—Pluto is the ...

Learn about the recently discovered trans-Neptunian object that may eventually join Pluto as a dwarf planet, found at the ...

For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, ...

(Correction: An earlier version of this story misstated how far Pluto is from the sun. The correct number is 3.7 billion miles.) What was discovered in Flagstaff, Arizona, and killed off in Prague?

Upon the discovery of its existence in 1930, Pluto enjoyed decades of special status as one of the solar ... Still, Ceres remains a dwarf planet. Perhaps as it should, given Pluto's relegation ...

This sparked debate about Pluto's status in the planetary canon ... Regardless of whether Pluto is a planet or a dwarf planet, it remains a fascinating part of the solar system, from its huge ...

Astronomers have announced the discovery of a new dwarf planet in our solar system, named 2017 OF201. Located far beyond ...

Once the quirky underdog of our solar system, Pluto held planetary status until 2006 ... Now officially labeled a “dwarf planet,” Pluto may have lost its title, but not our affection.

No. Pluto is still classified as a dwarf planet ... in town Pluto is Arizona's official state planet Regardless of the debate about its status, Pluto is Arizona's official state planet.

In a controversial vote, astronomers — not planetary scientists — “demoted” Pluto to the status of being classified as a dwarf planet, taking away one major planet and reducing the number ...

Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet. Here's what to know about the short life of what was, for a single human lifetime, the solar system's smallest ...