Moonwalker, geologist, engineer, entrepreneur and former US Senator
We celebrate the 35th anniversary of the first moon landing by visiting with two Apollo astronauts. Moonwalker Harrison Schmitt talks about the legacy and promise of Apollo, while Rusty Schweickart tells of his experience on Apollo 9, and discusses his current efforts to protect Earth from a deep impact. Emily Lakdawalla looks at the famed greenhouse effect on three different planets, and Bruce Betts' What's Up! offers up a new space trivia contest.