Pluto hasn't been a planet for almost 20 years. In the early 2000s, scientists discovered several objects of a similar size to Pluto. So, during the summer of 2006, members of the International ...

What was discovered in Flagstaff, Arizona, and killed off in Prague? If you answered "Pluto's planethood," your grasp of the astronomical is excellent. Feb. 18 marks the 95th anniversary of the ...

In the year since NASA’s New Horizons spacecraft flew by Pluto, the dwarf planet has maintained its icy heart. But closer analysis of the trove of data collected by the space probe reveals intriguing ...

(Correction: An earlier version of this story misstated how far Pluto is from the sun. The correct number is 3.7 billion miles.) What was discovered in Flagstaff, Arizona, and killed off in Prague? If ...

(Correction: An earlier version of this story misstated how far Pluto is from the sun. The correct number is 3.7 billion miles.) What was discovered in Flagstaff, Arizona, and killed off in Prague? If ...

An animated GIF of a cartoon Pluto has gone viral online. Pluto has been trending on Twitter for almost two days after the first zoomed-in image of the 'dwarf planet' was released. NASA had ...