新华社洛杉矶2月27日电（记者谭晶晶）美国航空航天局27日宣布调整"阿耳忒弥斯"登月计划，将原计 划于2027年实施的载人登月任务推迟至2028年。 "阿耳忒弥斯2号"目前暂定在4月的发射窗口发射，但最终发射时间仍取决于数据分析结果及维修进展。 美国于2019年宣布"阿耳忒弥斯"登月计划，并于2022年11月完成"阿耳忒弥斯1号"无人绕月飞行测试任 务。此后，相关后续任务时间表已多次调整。（完） 按照新的规划，调整后的"阿耳忒弥斯3号"任务将尝试与美太空探索技术公司和蓝色起源公司正在研发 的商业月球着陆器进行交会对接，并进行在轨综合测试，对生命保障系统、通信系统和推进系统进行综 合检验，以及测试新一代舱外活动服等。美航空航天局将在与合作伙伴完成详细审查后，进一步确定此 次试飞任务的具体细节。 美航空航天局此次宣布调整登月计划前，"阿耳忒弥斯2号"载人绕月飞行任务近期实施了两次综合演 练，均出现技术问题，计划发射时间一再推迟。25日，美航空航天局将执行该任务的重型火箭"太空发 射系统"和"猎户座"飞船从发射台撤回装配大楼进行维修。美航空航天局表示，任务团队正处理火箭上 面级"过渡型低温推进级"的氦气供应异常问题 ...

Core Viewpoint - The former NASA administrator Michael Griffin expressed concerns about the feasibility of the U.S. manned lunar return program, suggesting that the U.S. is falling behind China, which is on a more effective path for lunar exploration [1][2][8]. Group 1: U.S. Lunar Program Challenges - The Artemis program, announced in 2019, has faced significant delays due to complex design and unverified technologies, with the Artemis 2 and Artemis 3 missions postponed multiple times [4][5]. - Griffin criticized the current Artemis 3 mission plan, stating it relies on untested technologies and complex operations that could jeopardize mission reliability [7][8]. - He highlighted that the U.S. has wasted time and may not achieve manned lunar landing before China, emphasizing the need for a simplified approach similar to China's strategy [1][2][9]. Group 2: Comparison with China's Lunar Program - China aims to land humans on the moon by 2030, with progress reported as smooth and on track, contrasting with the U.S. delays [2][4]. - Griffin noted that China's lunar mission plan is simpler and more aligned with the successful Apollo program, utilizing a dual-rocket launch system that has proven technologies [8][9]. - The Chinese government’s ability to execute long-term plans consistently provides them with advantages in project continuity and stability, which Griffin believes the U.S. political system struggles to match [9].

Core Points - NASA announced that the first crewed lunar flyby mission, Artemis 2, is scheduled for April 2026, with a possibility of an earlier launch in February 2026, marking a shift from previous delays [1][3] - Safety remains the top priority for NASA as they aim to meet the new timeline for the Artemis 2 mission [1] - The Artemis program, initiated in 2019, aims to return humans to the Moon, with Artemis 1 having already completed an unmanned test flight [3] Summary by Sections Mission Timeline - The original plan for Artemis 2 was to complete it by 2024, followed by Artemis 3 in late 2025. However, both missions have faced multiple delays, with the latest schedule pushing Artemis 2 to April 2026 and Artemis 3 to mid-2027 [3][4] - NASA's adjustments to the timeline were influenced by technical issues, particularly concerning the Orion spacecraft's heat shield and life support systems [4] Technical Challenges - The Artemis program has encountered significant technical difficulties, with at least eight out of thirteen critical items falling behind schedule [4] - The Orion spacecraft, developed in collaboration with Lockheed Martin, faces design flaws, while the Space Launch System (SLS) rocket, developed with Boeing, has been criticized for delays and high costs [4] - The Starship, developed by SpaceX, is expected to replace the SLS in the future due to its ongoing development challenges [4][7] Space Suit Development - The development of new space suits for astronauts is another hurdle, as the current suits are outdated and do not meet the requirements for the Artemis 3 mission [7] - The company tasked with creating the new suits, Axiom Space, has indicated that a redesign is necessary to incorporate emergency life support systems [7] Future Prospects - Experts suggest that even if the Artemis 2 mission is successful, the timeline for Artemis 3 may still be optimistic, given the current state of the Starship and its readiness for lunar missions [7]

Core Viewpoint - NASA is experiencing a significant wave of resignations, with over 4,000 employees, accounting for more than 20% of its workforce, submitting their resignation applications, reflecting deep concerns about the future of U.S. space strategy and the impact of budget cuts under the Trump administration [1][3][4]. Group 1: Resignation Wave - The resignation wave at NASA is attributed to dissatisfaction with the Trump administration's budget cuts and political instability, leading to a loss of confidence among employees [3][6]. - The departure of approximately 4,000 employees raises concerns about the operational capacity of NASA and its ability to fulfill ambitious projects like the Artemis lunar program [1][4]. Group 2: Budget Cuts and Policy Impact - The Trump administration's significant cuts to NASA's budget have disrupted normal research operations and jeopardized the U.S.'s leadership in international space exploration [3][4]. - The lack of a permanent NASA administrator since May, following the withdrawal of Jared Isaacman’s nomination, has contributed to uncertainty and dissatisfaction within the agency [3][6]. Group 3: Competitive Landscape - The U.S. space exploration sector faces increasing competition from other nations, particularly China and Russia, as well as private companies like SpaceX, which are rapidly advancing their own space programs [4][6]. - The shift towards a "private enterprise + government" model for space exploration under the Trump administration may undermine NASA's traditional role and create further uncertainty in U.S. space strategy [4][8]. Group 4: Structural Crisis - The current situation at NASA reflects a deeper structural crisis in U.S. space exploration, characterized by financial strain, management chaos, and a significant loss of talent [6][8]. - The ongoing political turmoil and lack of stable leadership may hinder NASA's ability to innovate and collaborate internationally, threatening its future in the global space race [8].