ENFIN ! Les PREMIÈRES images d'ARTEMIS 2 "AUTOUR" de la LUNE ! (NASA) - Le Journal de l'Espace

The Artemis 2 mission recently completed its lunar flyby, with four astronauts traveling over 400,000 km from Earth. NASA released incredible images from this journey, showing the Moon from the Orion capsule with its craters and reliefs, offering a unique perspective compared to views from Earth. The images of Earth are also striking, making our planet appear tiny and emphasizing the profound shift in perception experienced by astronauts. Artemis 2 is not a lunar landing mission but rather a test mission orbiting the Moon. The astronauts launched last week aboard the SLS rocket, and their Orion capsule was sent towards the Moon. After several days, they reached a lunar flyby trajectory, using the Moon's gravity to alter their path and send the spacecraft back towards Earth. This "free return trajectory" is a crucial safety feature, allowing the vessel to return to Earth even in case of major problems. Beyond the spectacular visuals, Artemis 2 is primarily a critical test mission for the future of the program. Its first objective is to validate the Orion spacecraft with a crew on board. While Artemis 1 completed the journey without humans, Artemis 2 is testing life support systems, air and water management, temperature control, and crew comfort and ergonomics, especially given the challenges of spending several days in a small spacecraft. The second objective is to test deep space operations, a significant departure from recent manned missions that have primarily occurred in low Earth orbit, such as those involving the International Space Station. At this greater distance, astronauts are exposed to more radiation and experience communication delays. This more demanding environment requires proving that humans can live and work safely. The third objective is to test navigation, maneuvers, and coordination with ground teams, given the immense distance of over 400,000 km, where even small errors can have significant consequences. To put this distance into perspective, the International Space Station orbits at about 400 km altitude, making Artemis 2's journey 1000 times farther. No human has traveled this far from Earth since the Apollo missions in the 1970s. Artemis 2 marks a true return to deep space exploration, offering the astronauts a unique experience as they observe the Moon and watch Earth recede and reappear. The astronauts are currently on their way back to Earth. The return journey will last several more days, with the most critical phase being re-entry into Earth's atmosphere. Orion will enter at approximately 39,000 km/h, generating intense heat due to air friction. The heat shield is crucial for protecting the vessel and crew during this brief but vital moment, allowing the capsule to slow down. Afterward, Orion will deploy parachutes before splashing down in the ocean. If successful, Artemis 2 will pave the way for future missions, including Artemis 3, which will test lunar landers in Earth orbit, and Artemis 4, ambitiously planned for 2028, which aims for a return to the Moon's surface. For now, the success of Artemis 2 is paramount, and so far, it is proceeding as planned.