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 ...

The methane gas may constitute a rarefied atmosphere, or it may come from erupting plumes on Makemake’s surface.

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.

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 ...

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 is showing us a diversity of landforms and complexity of processes that rival anything we’ve seen in the solar system,” said New Horizons Principal Investigator Alan Stern, of the Southwest ...

Pluto has just been found to be ever so slightly bigger than we thought, having a diameter of 2,370km. The measurement was made by the New Horizons probe which is just about to flyby the dwarf world.

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 ...