Planetary Radio - NASA Leaders on Getting Humans to Mars

The human journey to the Red Planet is long and hard, but Mat’s conversation with three NASA Associate Administrators at the Humans to Mars Summit was filled with cautious optimism. Emily Lakdawalla shares a beautiful image of Saturn almost lost in the myriad stars of the Milky Way. The first Space Launch System rocket won’t carry astronauts, and Bill Nye says that’s probably a good thing. Bruce Betts reports in from the Planetary Defense Conference in Tokyo for this week’s What’s Up.