SpaceX's next Dragon cargo ship launch for NASA will lift off on April 21

NASA's next special delivery to the International Space Station has a launch date, but it's going to be one for early-birds.A SpaceX Falcon 9 rocket will launch an uncrewed Dragon cargo ship packed with tons of supplies on Monday, April 21, from the historic Pad 39A of NASA's Kennedy Space Center in Cape Canaveral, Florida. Liftoff is set for 4:15 a.m. EDT (0815 GMT), making it a predawn launch."Along with food and essential equipment for the crew, Dragon is delivering a variety of experiments, including a demonstration of refined maneuvers for free-floating robots," NASA officials wrote in an announcement for the mission, called CRS-32. "Dragon also carries an enhanced air quality monitoring system that could protect crew members on exploration missions to the Moon and Mars, and two atomic clocks to examine fundamental physics concepts, such as relativity, and test worldwide synchronization of precision timepieces."While NASA did not detail how much cargo will launch aboard the Dragon...