Nasa's new moon rocket has sprung another dangerous fuel leak, 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 322ft (98-metre) rocket, the most powerful ever built by Nasa.

Nasa's new moon rocket has sprung another dangerous fuel leak, 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 322ft (98-metre) rocket, the most powerful ever built by Nasa.