Four astronauts are now inexorably bound for the Moon

The Orion spacecraft has made a significant leap forward, successfully igniting its main engine for nearly six minutes on Thursday. This crucial maneuver has set four astronauts on a trajectory that will take them around the Moon in a remarkable free-return path. For NASA and the crew of Artemis II, this moment marks a pivotal point with no turning back for over a week. Notably, a staggering three-quarters of the global population has never witnessed humans venturing beyond low-Earth orbit, a feat last achieved in 1972 during the final Apollo mission to the Moon. The "translunar injection" burn of Orion's engine occurred just a day after the mission's successful launch aboard NASA's Space Launch System rocket from Kennedy Space Center on Wednesday. This firing is the last major engine burn for Orion, setting the crew on course to orbit the Moon on Monday, using the Moon’s gravity to slingshot back toward Earth, with a planned splashdown in the Pacific Ocean on April 10. "Things are going really well right now," stated Lori Glaze, NASA’s senior official overseeing exploration, during a press briefing on Thursday evening. "I don’t think we could be more pleased." The decision to leave Earth’s orbit followed an intense day for the four-member crew: Reid Wiseman, Victor Glover, Christina Koch, and Jeremy Hansen. They meticulously tested Orion's life support and propulsion systems, ensuring the spacecraft is fully prepared for the extended deep-space mission ahead. Howard Hu, NASA’s Program Manager for Orion, reported that the life support systems, including critical carbon dioxide scrubbers and water systems, performed exceptionally well. There was a minor hiccup involving Orion’s toilet during initial testing, where insufficient water was added to prime the pump, causing it to malfunction. However, once more water was introduced, the system began to operate correctly. As the mission progresses, anticipation builds for this groundbreaking journey, a significant step in humanity's exploration of the cosmos.