On the 95th anniversary of its discovery, Pluto remains one of the most beloved and enigmatic worlds in our solar system, ...

Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet. Here's what to know about the short ...

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

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

Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

Whether Pluto is officially a planet is the least interesting thing about the runt of the solar system, astronomers will tell you 95 years after the discovery of the fascinating and sometimes ...

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

The annual event celebrates the discovery of the little planet with a big heart and other scientific advances at Flagstaff, ...

We’ve learned a lot about poor, poor little Pluto — thanks to NASA’s New Horizons probe, which visited the dwarf planet in 2015. 1 - Instead of an ancient, inert rock, we’ve found an icy ...