NASA's SLS Moon rocket arrives at launch pad for the first time
 

NASA's Space Launch System has finally reached the pad — although an actual launch is still some ways off. The SLS rocket and the Orion spacecraft it carries arrived at Kennedy Space Center's Launch Pad 39B for the first time at 4:15AM Eastern today (March 18th) for one last test before the uncrewed (and delayed) Artemis I mission to the Moon. The team will conduct a "wet dress rehearsal" that replicates the mission short of liftoff, including the propellant load, countdown procedures and draining tanks.

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