Ask almost anyone why Pluto stopped being a planet and you will hear the same confident answer: it was too small. That answer ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Artistic representation of the huge and slow impact on Pluto ...

Forbes contributors publish independent expert analyses and insights. Amanda Kooser covers the quirky side of science and space. Pluto has five moons, but Charon stands out from the rest. Charon is ...

Pluto is no longer a planet. The world’s top group of astronomers, the International Astronomical Union, has stripped Pluto of the status it has held since its discovery 76 years ago. The body decided ...

Just when you thought it was safe to go to Pluto, scientists have declared that it's not a planet. These are the same scientists who maintain that humans come from monkeys. Pluto is 4 billion miles ...

Charon is large in size relative to Pluto, and is locked in a tight orbit with the dwarf planet. A new simulation suggests how it ended up there. By Jonathan O’Callaghan Some 4.5 billion years ago, ...