Life, the Universe and Everything
Ever ponder the mysteries of the universe? Join Director of the Hayden Planetarium Neil deGrasse Tyson for a casual conversation about stars, planets, the universe, and beyond. Dr. Tyson is answering questions from the audience for the duration of the program.
Pluto: Planet or not? We don’t use the word planet anymore. It’s no longer a useful word. Pluto is mostly ice. If it was where Earth is right now, it would grow a tail.
Now, what kind of behavior is that for a planet? We have words for things that grow tails: comets. Pluto and comets have more in common with each other than either of them have with any of the rest of the planets.