NASA calls off Endeavour launch attempt due to technical problem 2011-04-30 00:16:06 GMT+7 (ICT) KENNEDY SPACE CENTER (BNO NEWS) -- The launch attempt of the space shuttle Endeavour was called off on Friday afternoon due to a technical problem with its heaters. With weather 70 percent 'go', the space shuttle Endeavour was expected to launch on its last flight into space at 3.47 p.m. Eastern time on Friday. But a last-minute problem with the spacecraft's heaters forced NASA to cancel