SLS before Aug. 29 scrub
Engineers spent more than two and a half hours trying to correct a problem with a hydrogen bleed line for one of four engines in the core stage of the SLS before calling off the launch Aug. 29. Credit: NASA TV

Updated 9:30 a.m. Eastern with Nelson remarks.

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Jeff Foust writes about space policy, commercial space, and related topics for SpaceNews. He earned a Ph.D. in planetary sciences from the Massachusetts Institute of Technology and a bachelor’s degree with honors in geophysics and planetary science...