Rob Manning Says Landing on Mars is Hard!

Could landing people on Mars be harder than doing the same on the Moon or Earth? Maybe, according to engineer Rob Manning. He'll tell us about new solutions. Emily Lakdawalla knows that rings are not forever in this week's Q&A, while Mat and Bruce Betts relax by the pool for What's Up, while they give away a Planetary Radio t-shirt in this week's trivia contest.