Modified SLS Tanking Test Halted 20 Sec. Before Planned Cutoff

Space Launch System
Credit: NASA/Joel Kowsky
CAPE CANAVERAL—NASA successfully fueled its Space Launch System (SLS) rocket for the first time at the launchpad on June 20, but a hydrogen leak stymied plans for full countdown dress rehearsal. A software workaround allowed the launch team to resume the countdown in an attempt to get to 9 sec...

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