How many dwarf planets are there in our solar system? The recent discovery of 2017 OF201 makes the tally anywhere between ...

Come on down to the underworld folks, we're talking Pluto. Named for the maiden-snatching, shadow-dwelling god of the underworld, the small but mighty planet Pluto is associated with sex, death ...

Although not a planet, Pluto does have enough gravitational power to have five known Moons. ... Nix – this small moon is the inner of the two moons discovered orbiting Pluto in 2005.

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

The year was 2015. After traveling billions and billions of miles through the Erebus, New Horizons encounters the boatman, and the somber lord of the departed. The spacecraft could have been ...

Pluto was long considered our ninth planet, but the International Astronomical Union reclassified Pluto as a dwarf planet in ...

Over the past decade, researchers have been puzzling through Pluto’s mysteries. Meanwhile, the New Horizons probe heads for interstellar space.

Pluto was the little planet that could — until it couldn’t. Discovered in 1930 at Lowell Observatory in Flagstaff, Arizona , Pluto was hailed as the ninth planet in our solar system.

Pluto, therefore, is not the gravitationally dominant object in its neighborhood — and thus, not a planet, according to the new definition. Sign up for the Live Science daily newsletter now ...

Pluto was demoted from a planet to a dwarf planet in 2006. ... Why is Pluto not considered a planet? That year, the IAU tasked a small committee with creating a working definition of a "planet." ...

In 2006, the IAU famously dropped Pluto from the pantheon of planets because it did not meet the union’s criteria. As stated on the union’s website, a planet in the solar system: ...