Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

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

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

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

Charon is the largest moon of the dwarf planet Pluto ... Styx is also the name for one of the smaller moons in the Pluto system, and the others (Nix, Kerberos and Hydra) also have connections ...

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

Pluto seemed hopelessly cold ... that heart-shaped feature named in honor of Clyde Tombaugh, the astronomer who discovered the dwarf planet in 1930 while working at Lowell Observatory in Flagstaff.

Pluto, our planet of profound change and ultimate reckoning, has set up shop in Aquarius, and the energy of the dwarf daddy of death’s transit will have a weighty effect on all of us.

the “ninth planet” discovered (later demoted to “dwarf planet”) was named Pluto. Charon was the boatman who ferried the souls of the newly deceased across the River Acheron from the land of the living ...