An amateur astronomer discovered Pluto 95 years ago today. The former planet will complete an orbit in another 153 years.

The controversy endures over Pluto's true status, but the solar system underdog continues to capture hearts across the globe.

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary status.

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto ...

On today’s date 95 years ago, everyone’s favorite not-quite-a-planet, Pluto, was discovered by astronomer Clyde W. Tombaugh ...

Pluto was once the ninth planet of our solar system, until scientists reclassified it in 2006, sparking outrage and debate. But why was Pluto kicked out of the planetary club? The answer lies in a new ...

NASA’s Lunar Trailblazer will map the Moon’s water, using advanced instruments and gravity-assisted navigation to unlock vital resources for future space exploration.