Good afternoon, space fans! This #ThrowbackThursday returns us to 2011, when NASA and ATK Space Systems successfully completed a two-minute, full-scale test of Development Motor-3 – NASA’s largest and most powerful solid rocket motor ever designed for flight. ATK manufactures the five-segment solid rocket boosters for NASA’s Space Launch System (SLS), essential components of the world’s most powerful rocket. Any questions? You’re in luck! Hop on to Twitter today at 3 p.m. EST for a #Spacechat with ATK's Gordie Russell, where you can ask questions about the upcoming #SLS booster firing. Don’t forget to tag #spacechat XploreDeepSpace and ATK. Credit: NASA/ATK #SLSFiredUp #JourneyToMars #smokeandfire #progress #testing #rocket #science #space #exploration #spacechat