NASA SLS Core Stage Proceeds to Green Run Hot Fire

NASA completed the wet dress rehearsal, the seventh test of the Space Launch System (SLS) rocket core stage Green Run test series at the agency’s Stennis Space Center near Bay St. Louis, Mississippi, on Dec. 20. During the test, 733,000 gallons filled the liquid hydrogen and liquid oxygen tank. A key part of the test was to load the propellant and the replenish it to keep the tanks full as the gas naturally boils off. The mist around the stage in this video is actually the propellant boiling off during the test. The wet dress rehearsal test is one of the most extensive tests of the entire series and marks the first time that the rocket stage is filled and drained of liquid propellant. The next time the propellant tanks are filled, NASA will be moving toward Green Run hot fire testing targeted for Jan. 17, 2021.

Credit: NASA's Marshall Space Flight Center

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