Three-headed Cerberus is Hydra's sibling. "Cerberus: How could you go wrong with a name like that?" Showalter said. "But, unfortunately, Cerberus is already the name of an asteroid. The IAU balks at ...

A fourth moon orbiting the dwarf planet Pluto has just been discovered. The tiny satellite — it's a mere 8 to 21 miles (13 to 34 km) across — showed up as a faint dot on new, long-exposure photos of ...

A few weeks ago, we made a post notifying fans of a contest to name P4 and P5, two of Pluto’s five moons. These two moons are the only two such objects orbiting the icy dwarf-planet without a name.

The International Astronomical Union (IAU) announced Tuesday that names voted on by the public had been accepted for Pluto's fourth and fifth moons. Kerberos and Styx, formerly known as P4 and P5, ...

The action star entertained a young fan on the set of his upcoming Hercules The Nemean Lion. The Hydra. The capture of Cerberus. The fabled 12 Labors of Hercules are the stuff of legend. But now, with ...

In these two images from the Hubble Space Telescope, Pluto's new moon, P4, can be seen to move around the dwarf planet. NASA, ESA, and M. Showalter (SETI Institute) Pluto has a fourth moon, scientists ...