Pluto may have been demoted to non-planet status, but it still commands a court of five moons, as is fitting for the king of ...

In the time Pluto was found, classified as a planet and reclassified as a dwarf planet, it has not completed one orbit. One year on the distant ice planet is 248 Earth years, and one day is 153 Earth ...

On August 24, 2006, the International Astronomical Union had decided on the official definition of a word that before that day had seemed almost unambiguous. They decided that a planet must meet three ...

This story is part of Short Wave's series Space Camp about all the weird, wonderful things happening in the universe. Check out the rest of the series. If you were born in the last century you might ...