NASA engineers are testing the Space Launch System moon rocket's flight termination system ahead of rollout.
which marks the final test before the megarocket rolls out to the pad later on Tuesday night (Aug. 16).
The SLS rocket is due to send an uncrewed Orion spacecraft around the moon and back on what is the Artemis 1 mission. The first launch window is scheduled for Aug. 29. Backup launch windows are set for Sept. 2 and 5. N
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