関連ワード:  is elon musk part of spacex    is elon musk still part of spacex    is elon musk ceo of spacex    is elon musk owner of spacex    is elon musk founder of spacex    is elon musk head of spacex    is elon musk spacex    is elon musk spacex publicly traded    is spacex owned by elon musk    is elon musk involved in spacex