Did you know that each of the RS-25 engines for the first four flights of the Space Launch System (SLS) is a distinct individual, with its own designation and history? Pictured here, Engine 2059 roars to life during testing at Stennis Space Center (NASAStennis). To learn more about these powerful engines, check out the SLS Rocketology blog. blogs.nasa.gov/Rocketology Credit: NASA #NASA #Stennis #RS25 #SLS #SLSFiredUp #rocketscience #progress #madeinUSA