Pluto will mark a birthday of sorts on March 23, 2178. No one is likely to be there to celebrate it, of course. Even if ...

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

Pluto may not be a planet any more, but you still have a chance to see the distant dwarf planet at one of Michigan's ...

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

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

February 18th has been a significant date throughout history, marking a variety of events that have shaped the world. In a ...

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

Scientists at NASA for the first time have been able to observe the make up of Pluto and other small and icy celestial bodies ...

Tombaugh's photos that led to the discovery of Planet X. Pluto never really fit in with the other planets in the solar system. Its orbit was out of plane with the other planets. From 1979 to 1999 ...

Pluto is a fun hound/ACD mix. He is silly, playful, and eager to please. Watching him chase his tail is hilarious and ...

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