関連ワード:  is elon musk the creator of spacex    is elon musk the founder of spacex    is elon musk the founder of tesla and spacex    is elon musk the ceo of spacex    is elon musk the owner of spacex    is elon musk head of spacex    elon musk spacex engineer    is elon musk the chief engineer of spacex    is elon musk the sole owner of spacex    is elon musk the head engineer of spacex