Pluto's outermost moon, Hydra, was named for a legendary Greek water monster, and it's living up to its name: New data show that the little moon is almost entirely covered in "nearly pristine" water ...

Eighty-five years ago today, Clyde Tombaugh found a small dot of light shifting position while hunting for the trans-Neptune planet predicted by Percival Lowell. Now, the New Horizons probe en route ...

If you’re looking for a place to chip off an ice cube for a cool interplanetary drink, you can’t do much better than Hydra, Pluto’s outermost moon. Newly released readings from NASA’s New Horizons ...

Pluto has five known moons. In order of distance from Pluto, they are: Charon, Styx, Nix, Kerberos, and Hydra. While Pluto’s largest moon, Charon, has grabbed most of the lunar spotlight, two of Pluto ...

Two of Pluto's small satellites are getting their moment in the sun. Newly released photos captured by NASA's New Horizons spacecraft during its historic Pluto flyby on July 14 reveal intriguing new ...

Two of Pluto's five known moons have been photographed by the New Horizons probe, including one which features an intriguing red blotch. Images of the reddish-tinged Nix, which were captured July 14 ...

While Pluto’s largest moon Charon has grabbed most of the lunar spotlight, two of Pluto’s smaller and lesser-known satellites are starting to come into focus via new images from the New Horizons ...

The names Nix and Hydra have been approved for the two small satellites of Pluto discovered in May 2005. The International Astronomical Union (IAU), the internationally recognized authority for ...

These images from ’05, taken by the Advanced Camera for Surveys, reveal Pluto, its large moon Charon, Nix and Hydra (Image Credit: NASA/JPL) Of course they’ve always been real worlds. They just never ...

In 1930, Pluto was observed for the first time. For many decades, astronomers thought that the "ninth planet of the Solar System" was a solitary object. But by 1978, astronomers discovered that it ...

Since its discovery in 2005, Pluto’s moon Hydra has been known only as a fuzzy dot of uncertain shape, size, and reflectivity. Imaging obtained during New Horizons’ historic transit of the ...

In Greek mythology, the hydra was a many-headed dragon snake with regeneration powers. That's impressive, but I'm pretty sure that its namesake moon has officially eclipsed its forbearer. "Pluto and ...