This week's #throwbackThursday theme: 'Four Lessons in Four Years' Way back in 2011, when the world’s attention was on the end of the space shuttle program, a small group of engineers was tasked with planning what would come next. NASA revealed the answer on Sept. 14 of that year in the form of Space Launch System (SLS) – which would be the most powerful rocket in history and would allow #astronauts to travel beyond Earth orbit for the first time since #Apollo. In the four years since, we’ve made substantial progress, going from an early concept into manufacturing, testing, and even flying our first hardware on Orion’s Exploration Flight Test-1 in December 2014. In honor of the fourth anniversary of that announcement, here are four things we’ve learned in four years. (With a big thanks to former SLS Program Manager and now Marshall Space Flight Center [NASA_Marshall] Deputy Director Todd May, who helped with this list.) 1. Change Is Hard. It’s Also Necessary. 2. There’s the Baby, an...