Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why ...

Since its discovery in 1930, the dwarf planet has revolved beyond ... (Read more on Nadia Drake’s blog at National Geographic, No Place Like Home.) “The Pluto we imagined will just go away ...

This story appears in the July 2013 issue of National Geographic magazine ... the past and future orbits of the planets. The first clue came from Pluto. The oddball of the solar system, it ...

Almost 10 years ago, a NASA spacecraft was able to take several photos of Pluto, known for decades as a planet before it was ...

He called this hypothetical world "Planet X." "In some ways, Pluto's more of a planet than some of the other established ...

9 must-see night sky events to look forward to in 2025 9 must-see night sky events to look forward to in 2025 Did Pluto ever actually stop being a planet? Experts debate. Did Pluto ever actually ...