ロケット打ち上げ、スペースXが事実上独占 – WSJ
https://www.google.com/url?rct=j&sa=t&url=https://jp.wsj.com/articles/elon-musks-spacex-now-has-a-de-facto-monopoly-on-rocket-launches-4fd03c6b&ct=ga&cd=CAIyHGQxNzkwNjc2MTI3Y2MyOTE6Y28uanA6amE6SlA&usg=AOvVaw1ZVwHwGpODby9p0IxDYmUg