Elon says : Commercial space flight ' n't be affordable without reusable rockets . Musk also recounted the stressful moments around last week 's launch of the unmanned Dragon cargo vessel , which linked up with the Space Station last Sunday . CEO of the Dragon talks at South by Southwest Interactive festival . The SpaceX Dragon is currently docked at the International Space Station . He also is CEO and chief executive at Tesla Motors , maker of electric cars .
Elon says : Commercial space flight ' n't be affordable without reusable rockets . CEO of the Dragon talks at South by Southwest Interactive festival . The SpaceX Dragon is currently docked at the International Space Station . He also is CEO and chief executive at Tesla Motors , maker of electric cars .