Pluto may have been demoted to non-planet status, but it still commands a court of five moons, as is fitting for the king of darkness; after all, Pluto is the Roman equivalent of the Greek God Hades.

Back in the 1980’s, a now-defunct magazine called Science Digest held a contest to name Planet X — the still-undiscovered world that astronomers believed might lie out beyond Pluto. One of the best ...

Add Yahoo as a preferred source to see more of our stories on Google. Pluto and Charon Getty Images/HYPERSPHERE/SCIENCE PHOTO LIBRARY Pluto, considered the ninth planet in our solar system until it ...

Mark Showalter, who discovered two of Pluto’s moons as the mission was making its nine-year journey, said he truly expected to find many more, as did Alan Stern, the mission’s principal investigator.

For billions of years, Pluto and its largest moon Charon have been facing each other in a mutual tidal lock. Since it’s about half the size of Pluto, the moon and its planet are sometimes referred to ...

This composite image of Pluto, right, and Charon, its largest moon, showcases photos captured by NASA’s New Horizons spacecraft in July 2015. Unlike how scientists believe Earth's moon formed billions ...

Pluto is no longer classified as a planet, it’s a dwarf planet, however, it still has five moons. Now astronomers say they have detected CO2 and other compounds on one of its moons for the first time ...

Brad E Tucker does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

A researcher has used advanced models that indicate that the formation of Pluto and Charon may parallel that of the Earth-Moon system. Both systems include a moon that is a large fraction of the size ...

Pluto, considered the ninth planet in our solar system until it was reclassified to dwarf planet status in 2006, is thought to have undergone an impact that broke off the largest of its five moons, ...