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
