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Crowds of space rocket enthusiasts got a close up experience as scientists tested the latest engine which could take humanity back to the moon.
NASA was testing the rocket engine at the Stennis Space Center in Mississippi, and hope it will be the system to allow a new generation of rockets to blast off into deep space.
More than 1,500 gathered there on Thursday this week, and got a chance to feel the power of the rockets which were anchored to the ground.