Clyde Tombaugh didn't set out to discover Pluto when he sent his sketches of the night sky to Lowell Observatory in Flagstaff ...

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 ...

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 ...

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

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

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

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

Here's what to know about the short life of what was, for a single human lifetime, the solar system's smallest planet. Pluto was discovered in 1930 by Clyde Tombaugh, an American astronomer at the ...

Trans-Neptunian objects (TNOs) are icy bodies that vary widely in size, from large dwarf planets like Pluto and Eris—each ...

Yellowstone, the hit western show starring Kevin Costner, is available to watch for free on Pluto TV this weekend.

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