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.

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

For decades, it captivated imaginations with its icy surface and distant orbit ... As a result, Pluto was reclassified as a “dwarf planet,” sparking debates among stargazers still hoping ...

It has a methane, nitrogen and carbon monoxide atmosphere and a surface temperature of minus ... adopted a resolution to reclassify Pluto as a dwarf planet. The reasoning was that it didn't ...