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 ...

Discovered: The Hubble telescope finds a fifth moon circling lowly non-planet Pluto; global warming takes a toll on cows; watching nanoparticles break up blood clots is fun; scorpion venom is actually ...

"The surfaces of Nix and Hydra are as close to unaltered as you can get." Two of Pluto's midsize moons may be made of the guts of its largest moon, Charon, new research suggests. New observations with ...

One of the closest and brightest globular clusters visible from Earth, M22 contains hundreds of thousands of stars packed into a tight, elliptical shape about 10,000 light-years away. Photograph by ...

"This mission should be able to image the whole of Pluto. It should be phenomenal." When NASA's New Horizons spacecraft sped by Pluto in 2015, it revealed an incredible world of ice and haze carved by ...