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Is Pluto a planet? Here’s why scientists gave it a cosmic demotion
Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why ...
Remember when Pluto was a planet? Here’s 10 photos NASA took of the dwarf planet
Almost 10 years ago, a NASA spacecraft was able to take several photos of Pluto, known for decades as a planet before it was ...
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Animation of Pluto's surface
New Horizons principal investigator Alan Stern says, "Pluto is showing us a diversity of landforms and complexity of processes that rival anything we've seen in the solar system." As the craft ...
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On 95th anniversary of Pluto discovery, its home observatory celebrates solar system’s underdog
FLAGSTAFF, Az. – Whether Pluto is officially a planet is the least interesting thing about the runt of the solar system, astronomers will tell you 95 years after the discovery of the fascinating ...