This morning, we posted a throwback to the Saturn I rocket. Now, some news about NASA's new, even more powerful rocket, the Space Launch System. The fifth and final segment for a full-scale test version of SLS's  booster was delivered March 2 to Orbital ATK's Promontory, Utah, test site. The aft -- or rear -- segment of the booster will be assembled with the other four segments, currently at the test stand, and outfitted for a second booster qualification ground test this summer. The test will measure the booster’s performance and also demonstrate that it meets applicable ballistic requirements. Credit: NASA #NASA #progress #SLS #SLSFiredUp #OrbitalATK #rocketry #rocketscience #technology #hardware