Dr. Neil deGrasse Tyson is a famous astrophysicist and TV personality. He is notable for his stance to move Pluto to “dwarf planet” status. Tyson has served on a number of astronomy commissions and is the director of the Hayden Planetarium. He also hosts PBS’s NOVA scienceNOW.

Celestial bodies in our Solar System are defined by a number of parameters. These establish their classification. The location of the bodies generally establish their makeup and size, and determine if they are planets, dwarf planets, asteroids or other celestial bodies.