Pluto isn't alone—it's part of the Kuiper Belt with possibly hundreds of other planet-sized objects. Because Pluto hasn't ...

For decades, Pluto was celebrated as the ninth planet of our solar system. However, in 2006, the International Astronomical ...

Today, when tens of thousands of minor planets have been discovered (most residing in an "asteroid belt" between Mars and Pluto), not even the meanest of teachers would require students to learn ...

So Pluto is a planet. Case closed. Well maybe not totally closed ... Therefore, the IAU says Pluto can't sit at the cool kids table with Venus and Saturn; its proper place is with bitch-ass ...

"Get over it. It's done. Just get over it." The StarTalk Radio host explains why it makes perfect sense to classify Pluto as a dwarf planet. Produced by Kamelia Angelova, Will Wei, & Alana ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

In fact, Charon and Pluto are so similar in size that they are considered a double dwarf planet system, not a planet and moon. Charon is smaller than Earth's moon. In fact, Pluto is smaller than ...

Not every talk at ... modern idea of having nine planets, which came about in the 1960s and lasted only until 2006, was a blip on the screen. And if you are still a Pluto-is-a-planet holdout ...

Narrator: OK, so basically Stern says it depends on context. But why? Back in the early '90s, Pluto was a planet, period. No context needed. So what changed? By the late '90s, it was becoming ...