NASA’s New Horizons mission has answered one of the most basic questions about Pluto — its size. Mission scientists have found Pluto to be 1,473 miles (2,370 kilometers) in diameter, somewhat larger ...

A new simulation of Pluto's upper atmosphere shows that it extends so far from the planet that stray molecules may be deposited on its largest moon, Charon. The new model predicts that Pluto's ...

This composite image shows color views of Pluto (right) and its largest moon Charon as they appeared on July 11, 2015 to NASA's New Horizons spacecraft ahead of a historic flyby on July 14.

Mission scientists have found Pluto to be 1,473 miles (2,370 kilometers) in diameter, somewhat larger than many prior estimates. Images acquired with the Long Range Reconnaissance Imager (LORRI) were ...

Explore Pluto's reclassification as a dwarf planet and how Eris's size advantage challenges old beliefs about planetary status. Images taken in December 2005 by Brown and others with the Hubble Space ...

In a universe full of planets, 2007 OR10 is something special. It’s big, just slightly smaller than the size of Pluto. And it’s close, within our very own solar system. So how did it still manage to ...

NASA's New Horizons mission has answered one of the most basic questions about Pluto—how big is it? Mission scientists have found Pluto to be 1,473 miles in diameter, somewhat larger than many prior ...

At a press conference, New Horizons' top dog Alan Stern just announced that his team has calculated Pluto's most accurate diameter yet: about 1,473 miles from one end to the other, give or take 12 ...

Pluto's surface hosts blades of ice that soar to the height of skyscrapers — and researchers have narrowed down exactly how the dramatic features form. According to new research, the blades are made ...

Pluto's largest moon, Charon, likely formed through a capture event in the early, crowded Kuiper Belt. Three-body encounters ...

In 2006, several months after New Horizons launched into space, Pluto stopped being a planet. That was according to the world's top astronomers, who said the celestial body failed to meet one of the ...