SpaceX's Falcon 9 rocket on Thursday launched 53 Starlink internet satellites to low-Earth orbit, marking the rocket's successful 200th launch. "Rocket reusability is key to enabling SpaceX's rapid launch cadence," the company said after completing the mission. The launch took place at NASA's Kennedy Space Center in Florida. The Elon Musk-led firm also launched 49 Starlink satellites on Tuesday.