What is a Planet

Owen Gingerich Gareth Williams Dimitar Sasselov In 2006, when the International Astronomical Union voted on the definition of a planet, confusion resulted. Almost eight years later, many astronomers and the public are still as uncertain about what a planet is as they were back then. Tonight, three different experts in planetary science will present each of their cases as to what a planet is or isn t. And then, the audience gets to is Pluto in or out