Pluto and Charon’s orbits hint that both share a collisional origin, but Charon’s wide circular orbit — about 16 times Pluto’s size away — raises questions that researchers have begun to answer using ...

The third criterion excluded Pluto, as it shares its orbit with other objects. Objects that are round but do not clear the orbit are classified as “dwarf planets”, a new category.

After being intertwined in a lopsided rotation, the pair became unstuck and Charon, being the smaller of the two, was doomed to a near-circular orbit around Pluto.

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

An amateur astronomer discovered Pluto 95 years ago today. The former planet will complete an orbit in another 153 years.

Gingerich, despite being the former head of the same committee that voted on Pluto's demotion, argued that Pluto was in fact a planet at the Harvard-Smithsonian debate.

Pluto's Striking Surface VariationsUniversity of Maryland astronomers Silvia Protopapa and Douglas Hamilton are among the authors of the first published paper from the New Horizons flyby, which ...

Today, let's talk about Pluto and Charon; these two have quite the story! Did you know that their 10-hour "intimate encounter" has shaken the field of astronomy to its core?