将航天发射系统核心阶段送入预定位置
NASA completed a milestone in preparation for Green Run testing of its Space Launch System (SLS) core stage with an August 23…
Raja Chari上校:美国宇航局宇航员候选人
NASA astronaut candidate Raja Chari climbs into a NASA T-38 aircraft, Friday, July 12, 2019, at Ellington Field in Houston, T…