One Pluto year equals 248 Earth years. At 1473 miles in diameter—about half the width of the United States—Pluto is the ...

First a planet, then it's not: Pluto is the only planet to get kicked out of the solar system club. Just seven months after New Horizons rocketed away from Cape Canaveral, Florida, the ...

A small team led by Sihao Cheng, Martin A. and Helen Chooljian Member in the Institute for Advanced Study's School of Natural ...

The International Astronomical Union, which reclassified Pluto as a dwarf planet in 2006, is the arbiter of such ...

However, some scientists argue that Pluto should be considered a planet based on geological activity rather than orbital mechanics. NASA’s New Horizons mission revealed ice mountains ...

During its initial journey to Pluto, New Horizons collected baseline data about Lyman-alpha emissions using the Alice instrument, an SwRI-developed ultraviolet spectrograph. A spectrograph is a ...

During its initial journey to Pluto, New Horizons collected baseline data about Lyman-alpha emissions using the Alice instrument, an SwRI-developed ultraviolet spectrograph. A spectrograph is a ...

However, some scientists argue that Pluto should be considered a planet based on geological activity rather than orbital mechanics. NASA’s New Horizons mission revealed ice mountains, glaciers and ...