美国国家航空航天局（NASA）已决定取消对太空发射系统（SLS）火箭的升级计划，将战略重心转向提升该火箭的发射频率。这一重大调整直接影响到波音公司价值20亿美元的探索上面级（EUS）合同。
NASA表示，此举旨在优化资源配置，优先确保阿尔忒弥斯登月计划等关键任务的发射节奏。原定的升级方案包括开发更强大的上面级以提高运载能力，但现已被更紧迫的飞行频率目标所取代。
行业观察人士指出，这一决策可能对波音公司的航天业务板块产生显著影响。该公司为SLS火箭核心级的主要承包商，此次合同调整或将引发后续商业谈判的重构。
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