The largest, most powerful rocket booster built for flight will fire up for a major ground test June 28 at Orbital ATK's test facilities in Promontory, Utah. This is the last, full-scale qualification test for the booster before the first, uncrewed flight of NASA's new rocket, the Space Launch System, with the Orion spacecraft in 2018. More information about the test can be found at: http://www.nasa.gov/exploration/systems/sls/sls-booster-chills-out-ahead-of-hot-ground-test.html. Learn more about SLS at www.nasa.gov/sls. #SLSFiredUp

Credit: NASA