An RS-25 engine test is set for at 3:30 PM CDT / 4:30 EST / 20:30 UTC and will be streamed at nasa.gov/nasatv. One of the guests of honor will be the Pegasus barge. NASA’s barge, Pegasus, will be used to ferry the massive core stage of the agency’s new rocket, the Space Launch System, on journeys from the Michoud Assembly Facility in New Orleans to other NASA centers for testing and for launches. Shown here, the NASA tugboat Clermont II transports liquid oxygen to the base of the B-1 Test Stand at Stennis Space Center. Stennis was NASA's facility for testing all Space Shuttle Main Engines before flight. Liquid hydrogen and liquid oxygen are used as fuel for the engines. Credit: NASA / c. 1981 #SLSFiredUp #JourneyToMars #NASA #progress #enginetesting #rocketscience #smokeandfire #heritage #nasahistory #mississippi #madeinusa nasastennis nasa_marshall nasa