美“登月火箭”就位，离发射还有多远

Core Viewpoint - The "Artemis 2" mission, featuring the Orion spacecraft and Space Launch System (SLS) rocket, has successfully reached the launch pad after a lengthy transport process, but the actual launch date remains uncertain due to necessary testing and evaluations [1][2]. Group 1: Transport and Arrival - The Orion spacecraft and SLS rocket combination, standing approximately 98 meters tall and weighing around 1500 tons, was transported to the launch pad using the "Crawler-Transporter 2," which weighs 3000 tons and can carry over 8000 tons [1]. - The transport process took nearly 12 hours, with the vehicle moving at a very slow speed of about 1 mile per hour, and the final approach involved climbing a sloped ramp [2]. Group 2: Testing and Preparations - Upon arrival at the launch pad, NASA engineers will conduct integration, testing, and a series of launch rehearsals, including a critical "wet dress rehearsal" where over 700,000 gallons of cryogenic liquid oxygen and hydrogen will be loaded [2]. - NASA may require multiple "wet dress rehearsals," as seen in the Artemis 1 mission, which underwent four such rehearsals before completion [2]. Group 3: Launch Timeline - After completing the necessary tests and evaluations, NASA will determine the launch date, with the launch window opening approximately every four weeks, providing 4 to 5 opportunities per window [3]. - The earliest potential launch date is set for February 6, when three American astronauts and one Canadian astronaut will embark on a 10-day lunar mission to test systems and hardware [3].