A space capsule powered in part by batteries from Joplin-based EaglePicher hurtled toward the moon Wednesday for the first time in 50 years, following a thunderous launch of NASA’s mightiest rocket in a dress rehearsal for astronaut flights.No one was on board this debut flight, just three test dummies. The capsule is headed for a wide orbit around the moon and then a return to Earth with a Pacific splashdown in about three weeks.After years of delays and billions in cost overruns, the Space Launch System rocket roared skyward, rising from Kennedy Space Center on 8.8 million pounds of thrust and hitting 100 mph within seconds. The Orion capsule was perched on top and, less than two hours into the flight, busted out…