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 ...

Finally, a family portrait of Pluto is beginning to emerge! For the first time ever, astronomers have captured two never-before-photographed moons orbiting Pluto. NASA's New Horizons spacecraft ...

Planets, moons and other celestial bodies are named according to rules established by the International Astronomical Union (IAU). Pluto did not have any rules for naming surface features because, ...

The discovery of another moon around Pluto is exciting news for planetary science, but it's also likely causing some anxiety for the team in charge of New Horizons, a spacecraft set to be the first ...

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Pluto will complete its first orbit since 1930 in 2178, a historic 248-year space journey that spans generations of humans.