The Planetary Society has just announced that LightSail will be launched into orbit on its first test flight in May. We’ll talk with Project Manager Doug Stetson and embedded LightSail reporter Jason Davis about what to expect. Bill Nye welcomes a special guest to a conversation about the meaning of this privately-funded solar sail. Emily Lakdawalla updates the Curiosity Mars rover mission and shares spectacular images from the Rosetta comet exploration. We close with Director of Science and Technology Bruce Betts and his recommendations of What’s Up this week.