Reinstating Pluto as a Planet

The July 12, 2015 article about Pluto was the start of a four-part series (Is Pluto a Planet?). The goal of the first article was the hope of rekindling a scientific and public conversation of “what a...

Is Pluto a Planet?

Do you know what a planet is? Most of us can tell the difference between a planet and a star and the difference between a planet and an asteroid or comet. Astronomers, like everyone else, like to...