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 ...

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 ...

In 1801, an Italian astronomer named Giuseppe ... objects such as Pluto and Eris—the International Astronomical Union in 2006 recommended that they be called "dwarf planets"—much as asteroids ...

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

A blue atmosphere, smooth areas, and youthful mountain ranges - this dwarf planet is full of surprises. When NASA's New Horizons probe flew past Pluto in July 2015, the images it returned astonished ...

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

Planitia structure on its surface. Ever since NASA's New Horizons sent back the first-ever photos of Pluto in 2015, the dwarf planet's mysterious heart-shaped region has puzzled scientists.

That’s because Pluto was downgraded from a “planet” to a “dwarf planet” in 2016 by the International Astronomical Union (IAU). However, this year a powerful new telescope is coming ...

One idea is that Pluto got its moon system when a massive object smashed into the dwarf planet. The resulting debris then formed into the moons. This hypothesis was nicknamed the “Big Whack.” ...

The mission, which was launched in 2006, took detailed photographs of the surface of Pluto, a dwarf planet and the largest object in the Kuiper belt. Now, a new scientific article published in the ...