What is a Planet? Mars, Pluto and Exoplanets as Examples

Harold Geller

A major topic on the internet today is the question of the definition of a planet. In 2006 the International Astronomical Union (IAU) officially changed the definition of a planet. No longer was Pluto to be called a planet, but a dwarf planet. We will examine examples of objects inside and outside our solar system; addressing the issue as to whether or not they should be considered an example of a planet. We will review the definition of planet as laid out by the IAU in 2006. We will also address a newly proposed definition of a planet. This definition not only includes Pluto, but adds dozens more to the party of planets.

A/V requirements: Laptop, LCD Projector, Screen