When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

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

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

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

is a disc-shaped region beyond the orbit of Neptune’s in the outer solar system—50 Earth-sun distances—that’s home to dwarf planets like Pluto, Makemake and Eris. It’s also thought to be ...

New research suggests that billions of years ago, Pluto may have captured its largest moon, Charon, with a very brief icy "kiss." The theory could explain how the dwarf planet (yeah, we wish Pluto was ...

Brown is the person who discovered Eris, a 10th solar system object that's about 27% more massive than Pluto. Some astronomers disagreed with the decision, with one going so far as to call it ...

Although Seeing in the Dark doesn't directly discuss Pluto, it does celebrate the joy of observing planets. Viewers who watch the show may wonder what happened to Pluto in 2006 and whether any of ...

Carbon Dioxide and Hydrogen Peroxide on Pluto's Moon Charon Oct. 1 ... or metamorphic activity within the icy dwarf planets Eris and Makemake, located in the Kuiper Belt. Methane detected on ...

Pluto may have got romantic to capture its largest ... to the other large Kuiper Belt Objects with large moons, like Eris and Dysnomia, Orcus and Vanth, and the others," Denton explained.