As we continue to make huge huge strides building the world's most powerful rocket, NASA's Space Launch System (SLS, launching in 2018 with the #Orion spacecraft from NASAKennedy), let's have a look at earlier shows of big progress. Pictured here, a crane puts reinforcing steel in place in October 2014 to prepare for pouring the concrete foundation of Test Stand 4697 at NASA_Marshall from where the SLS program is managed. SLS will be the world's most powerful rocket for human space exploration, able to carry astronauts in the Orion spacecraft on deep-space missions, including the journey to Mars. Credit: NASA #journeytoMars NASA_Marshall #throwback #SLSFiredUp #Orion #Huntsville #Alabama  #engineering #rocketscience