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An aerial view of Launch Complex 39B with Exploration Ground Systemsâ mobile launcher for the Artemis 1 mission on the pad. The mobile launcher, atop crawler-transporter 2, made its final solo trek from the Vehicle Assembly Building on June 27, 2019, and arrived on the surface of pad B on June 28, 2019, at NASAâs Kennedy Space Center in Florida. The mobile launcher will remain at the pad over the summer, undergoing final testing and checkouts. Its next roll to the pad will be with the agencyâs Space Launch System rocket and Orion spacecraft in preparation for the launch of Artemis 1.