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

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 ...

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 ...

"The data from the termination shock encounter will be a treasure trove for space physicists worldwide who are eager to ...

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

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

This week is the best time of year to spot Pluto in the ... So, just as the sun sets in the west, Pluto rises in the east. This trend will continue over the next few days, which will make Pluto ...

Tombaugh flipped back and forth between the images and watched ... surrounded our infant world. Over millions of years, that atmosphere escaped into space. Pluto is the only place in the solar ...

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

Scientists and astronomers have been debating over this IAU decision for years and the question remains. Should Pluto be renamed as a planet? American astronomer Percival Lowell first suggested ...