SA planned to launch the demo rocket on Tuesday but was stymied by cloudy skies over the Kennedy Space Center and by a boat that wandered into the launch danger zone.

• 航天局原定周二发射火箭样品，但是由于肯尼迪航天中心上空多云而且一艘小船驶进了发射危险地带才致使计划搁浅。