RS-25 engines powering NASA's SLS (Space Launch System) rocket use liquid oxygen and liquid hydrogen as propellants – the same elements that combine to create water (H2O). For an RS-25 engine test, liquid hydrogen and liquid oxygen are mixed in the engine combustion chamber and ignited, which results in extremely high-temperature exhaust (up to 6,000 degrees F) exiting the nozzle into the flame deflector at a very high rate and pressure. Hundreds of thousands of gallons of water also are flowing

17K views · 1K reactions | Today, NASA's Space Launch System core stage engine test ended about one minute into the expected eight-minute hot fire. Teams will assess the data from the engine shutdown to determine the next steps. Tune in to NASA TV for a post-test update at approx. 8pm ET: https://go.nasa.gov/38QpLO7 | NASA Artemis | Facebook

394K views · 1.3K shares | Today we successfully tested one of the four RS-25 engines that will power NASA's Space Launch System (SLS) rocket to deep space destinations, like Mars. This 500-second hot fire engine test marks another step toward the nation’s return to human deep-space exploration missions. Watch and learn more: https://nasa.tumblr.com/post/164801065084/today-we-successfully-tested-one-of-our-rs-25 | NASA - National Aeronautics and Space Administration | Facebook