Andrew Chaikin on the 40th Anniversary of Apollo 8

The author of A Man on the Moon and A Passion for Mars shares his thoughts about the first human mission beyond Earth and how the iconic Earthrise image challenges us to explore. Bill Nye says NASA is better off not working on solar power satellites. Bruce Betts tours the night sky in What's Up, helps Mat pick a new stellar classification mnemonic (it's a lot more fun than it sounds!) , and announces a new space trivia contest.