**NASA's Artemis Program Hits Major Roadblock as Rocket Sustainer Engine Fails** In a significant setback for the US space agency's ambitious Artemis program, a crucial sustainer engine test has failed, casting doubt over the mission's ability to return humans to the lunar surface by 2025. The Artemis program aims to establish a sustainable presence on the Moon, with the ultimate goal of sending humans to Mars in the coming decades. However, this latest setback raises concerns about the program's timeline and budget, which have already been scaled back significantly. As NASA struggles to overcome this hurdle, the future of the Artemis program hangs in the balance.