NASA's Artemis Program Hits Major Roadblock as Engine Testing Fails Again NASA's ambitious Artemis program, aimed at returning humans to the lunar surface by 2025, has hit a significant setback. According to recent reports, the Space Launch System (SLS) rocket's core stage engine, known as the RS-25, failed to meet performance expectations during a critical test firing. The incident marks the second failed test in a matter of months, raising concerns about the program's timeline and budget. With the stakes high and the clock ticking, NASA officials will be under intense scrutiny as they work to resolve the issues and get the Artemis program back on track.