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After failed tests, NASA's moon rocket heads back to workshop

After failed tests, NASA's moon rocket heads back to workshop

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NASA's Space Launch System rocket is heading back to its assembly building for repairs next week,

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pushing the earliest possible launch date for its uncrewed test flight to the moon to later this summer, officials said Monday.

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Since April 1, the space agency has been unsuccessfully attempting a key "wet dress rehearsal" test, so dubbed because it involves loading liquid propellant.

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The procedure is meant as a run-through of launch operations, including a final countdown to within 10 seconds before blast off, but without actually firing the engines.

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But NASA teams have encountered several technical hitches.

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These included a leak involving flammable liquid hydrogen, a faulty valve that prevented fueling of the upper stage

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