Lightning strikes NASA's Artemis 1 moon megarocket launch pad during test - Space.com

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Lightning struck the launch pad home of NASA's giant Artemis 1 moon rocket several times on Saturday (April 2), but the rocket is in good health and on track for a critical test.

Four lightning strikes hit the area around Launch Pad 39B, where NASA's first Space Launch System (SLS) megarocket is undergoing a three-day fueling test known as a "wet dress rehearsal" for its Artemis 1 mission to the moon later this year. The rocket is protected from lightning by three towers and a catenary wire structure to divert strikes to the ground away from the booster.

The first three lightning strikes were relatively low power events, NASA officials wrote in an update late Saturday. But the fourth strike, which hit "tower one" of the lightning protection system, was more powerful. The YouTube site Space Googlevesaire captured a clip of the lightning strike from NASA's live video stream of the fueling test.

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NASA's Artemis 1 Space Launch System moon rocket stands atop Launch Pad 39B at the Kennedy Space Center in Cape Canaveral, Florida during a fueling test on April 3, 2022. (Image credit: NASA Kennedy Space Center)

"1 of the strikes last night was the strongest we have seen since we installed the new lightning protection system," wrote Jeremy Parsons, NASA's deputy manager of the Exploration Ground Systems, who is live tweeting the test for the agency. "It hit the catenary wire that runs between the 3 towers. System performed extremely well & kept SLS and Orion safe. Glad we enhanced protection since Shuttle!"

Parsons said NASA upgraded Pad 39B's lightning protection system to include better shielding against strikes and better separate electrical current from launch hardware. Each of its towers is topped with a fiberglass mast and the catenary wires to divert lightning away from the rocket and its service structure, he added.

"The new system also has an array of sensors, both on the ground and the mobile launcher, will help determine the rocket's condition after a nearby lightning strike, which can prevent days of delays," Parsons wrote in a separate post.

At the time of the lightning strikes on Saturday, the Artemis 1 SLS rocket's core stage and its Orion spacecraft were powered up, but the rocket's side-mounted solid rocket boosters and an interim cryogenic propulsion stage were off, according to a NASA update.