Today's SpaceX launch will be logged in the history books as the first time a flight-proven orbital class rocket has successfully been relaunched and returned to Earth. "We just had an incredible day today," CEO Elon Musk said after the first stage Falcon 9 rocket made a clean landing "right in the bullseye" on the droneship Of Course I Still Love You. "This is gonna be ultimately a huge revolution in spaceflight," Musk said. "It's been 15 years to get to this point. I'm sort of at a loss for words. It's been a great day for SpaceX and space exploration as a whole."