NASA’s new moon rocket sprang another dangerous fuel leak Saturday, forcing launch controllers to call off their second attempt to send a crew capsule into lunar orbit with test dummies. The first attempt earlier in the week was also marred by escaping hydrogen, but those leaks were elsewhere on the 322-foot (98-meter) rocket, the most powerful ever built by NASA. Launch director Charlie Blackwell-Thompson and her team tried to plug Saturday’s leak. They tried twice, but the leak persisted. Blackwell-Thompson finally halted the countdown after three to four hours of futile effort. Read the latest on the launch at the link in our bio. #APPhoto by Brynn Anderson