On Thursday, March 17th, NASA unveiled the Space Launch System at Kennedy Space Center in Florida, rolling the behemoth vehicle out of the Vehicle Assembly Building — the largest single-story building in the world. NASA will be performing a wet dress rehearsal and more tests at historic Launch Complex 39B, a pad that has launched both the Saturn V and Space Shuttle.

"The launch team will load propellant into the rocket’s tanks, conduct a full launch countdown, demonstrate the ability to recycle the countdown clock, and also drain the tanks to practice the timelines and procedures the team will use for launch," according to a release from NASA.

The agency is preparing for Artemis-1, a spin around the moon that will test the capabilities of the long-in-development SLS and the Orion spacecraft that will be propelled from atop the rocket.

Photographers, including our own Jenny Hautmann, were in attendance for the rollout and captured the massive rocket's very slow roll through Kennedy Space Center, carried atop NASA's giant crawler at one mile per hour. We've included some of our favorite shots taken that day.

"It took 10-hours and 28 minutes for SLS and Orion to reach the launch pad four miles away," said NASA. "The trip began at 5:47 p.m. Thursday, March 17, and the 322-foot tall, 3.5-million-pound rocket and spacecraft arrived at the pad at 4:15 a.m. on March 18."

The first integrated flight of the SLS and Orion uses the Block 1 configuration, which stands 322 feet, taller than the Statue of Liberty, and weighs 5.75 million lbs. For Artemis I, SLS Block 1 will launch an uncrewed Orion spacecraft and 10 CubeSats to an orbit 40,000 miles beyond the Moon, or 280,000 miles from Earth.

Artemis I will lead up to the first humans returning to the moon since 1972, on the Artemis III mission.

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