Pluto is probably best known for being a demoted planet. In 2006, the International Astronomical Union stripped it of its ...

Pluto was once the ninth planet of our solar system, until scientists reclassified it in 2006, sparking outrage and debate.

The Moon is a natural satellite that orbits planet Earth. Many planets have moons, and some planets have many moons - Saturn has more than 50. The Earth has just one moon - the Moon. Pluto is a ...