2021-09-19 SpaceX社,民間人だけを乗せた有人地球周回飛行Inspiration4を完了。3日間地球周回 有人宇宙 SpaceNews(9/18)関連記事 ・Inspiration4 mission to conclude with Sept. 18 splashdown (SpaceNews(9/17)) ・SpaceX launches Crew Dragon on first private mission (SpaceNews(9/15)) ・Commercial spaceflight industry sees Inspiration4 as a pathfinder but not a model (SpaceNews(9/15))