The first satellites placed in geostationary orbit were the synchronous communication(SYNCOM)satellites launched by NASA in 1963.
第一个放置在止轨道的卫星是1963年美国航空暨太空总署发射的同步传输卫星.
The first satellites placed in geostationary orbit were the synchronous communication(SYNCOM)satellites launched by NASA in 1963.
第一个放置在止轨道的卫星是1963年美国航空暨太空总署发射的同步传输卫星.
Project Description: Gulfstream Aerospace and NASA's Dryden Flight Research Center tested the structural integrity of a telescopic 'Quiet Spike' sonic boom mitigator on a NASA F-15B testbed aircraft.
湾流航空和宇航局德莱顿飞行研究中心测试的结构完整性的伸缩'安斯派克'爆音缓和美国航天局的F - 15B条试验飞机。
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