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5月1日,太空探索技术公司(Space X)的猎鹰九号火箭执行国家侦察局的NROL-76任务,发射了一颗近地轨道军用卫星,火箭第一级回收成功,不过更引人注目的是火箭第二级进行了长达3.5小时的滑行后再次点火成功。猎鹰火箭第二级的滑行和点火试验,为上面级具备直送静止轨道的能力铺平了道路,假以时日联合发射联盟的运载火箭将面对更激烈的竞争。直送静止轨道的关键:长时间滑行和再次点火能力
On May 1, Space X’s Falcon IX rocket performed the NRO-76 mission of the National Reconnaissance Agency and launched a near-Earth orbiting military satellite. The first-stage recovery of the rocket was successful but more attractive Note that the second stage rocket up to 3.5 hours after the glide successfully re-ignition. The Falcon rocket level 2 taxiing and ignition tests paved the way for upper-level capabilities to have direct orbital orbit, with the launch of a more advanced launch vehicle for the United Launch Alliance in the face of more intense competition. The key to direct geostationary orbit: long glide and re-ignition ability