NASA astronaut Shane Kimbrough calls on an audience member who has a question during a presentation about his time onboard the International Space Station (ISS) during Expeditions 49/50, Tuesday, September 12, 2017 at Arlington Career Center in Arlington, Virginia. During Expedition 50, Kimbrough completed four spacewalks for a total of 39 hours outside the ISS, and concluded his 173-day mission when he landed in a remote area near the town of Zhezkazgan, Kazakhstan in April 2017. Photo Credit: (NASA/Aubrey Gemignani)