Musk : Commercial space flight wo n't be affordable without reusable rockets . CEO of SpaceX gives keynote at South by the International Space Station . The SpaceX Dragon is currently docked at Southwest Interactive festival . Elon Musk also is CEO and chief designer at Musk , maker of electric cars .
Elon Musk : Commercial space flight wo n't be affordable without reusable rockets . CEO of SpaceX gives keynote at South by Southwest Interactive festival . The SpaceX Dragon is currently docked at the International Space Station . Musk also is CEO and chief designer at Tesla Motors , maker of electric cars .