SpaceX made history Thursday after it successfully launched a used Falcon 9s back into space. SpaceX also returned it to Earth, landing it upright on a drone ship in the Atlantic Ocean. “It means you can fly and refly an orbital class booster, which is the most expensive part of the rocket. This is going to be, ultimately, a huge revolution in spaceflight,” SpaceX CEO Elon Musk appeared on the company’s live stream shortly after the landing and spoke about the accomplishment. SpaceX has said reusing rockets could lower launch costs by 30 percent of the $62 million starting price the company currently charges,