For many people, the definition of a planet was only made clear in 2006, when the spunky world Pluto was demoted from a planet to a dwarf planet. Now, a team of astronomers is pushing for “planet” ...

Anyone fuming over Pluto’s demotion from full-fledged planet to dwarf planet in 2006 will be happy to hear that there is still hope. Pro-Plutonians recently suggested a new definition of a planet that ...

For nearly two decades, Pluto has been known as a dwarf planet—but the debate is far from over. New discoveries have revealed ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. In 2006, the International ...

Hey, remember Pluto? Of course you do! When most of us were brought up in school we learned that there were nine known planets in the Solar System, and Pluto was the one that hung out on the outskirts ...

As the United States prepares to celebrate its 250th anniversary, the history of the solar system tells its own story of ...

Maybe Pluto is a planet after all. The icy ball at the outer edge of the solar system was considered a planet from its discovery in 1930 until 2006, when a global astronomy organization made the ...

What is a planet? Prior to August 24, 2006, the answer was simple, vague, but generally agreed-upon: large, round-ish, orbiting a star, perhaps. Most people could name nine examples without much ...