John Casani on NASA's Prometheus Project

If all goes well we are less than ten years away from the nuclear electric era of space exploration. That's the goal of the Prometheus Project. We visit with Project Manager John Casani. Were Earth and Mars ever twins? That's Emily Lakdawalla's topic in this week's Q&A segment. And Bruce Betts travels through the looking glass for this week's What's Up space trivia contest.