NASA’s Space Launch System rocket stands atop pad 39B at the Kennedy Space Center. After working around a hydrogen leak at the base of the rocket, engineers spent the day Monday pumping more than 750,000 gallons of supercold liquid oxygen and hydrogen fuel into the 32-story-tall launcher in a dress rehearsal countdown. How the leak might play into plans to launch four astronauts on a moon mission as early as Sunday is not yet clear.
NASA’s Space Launch System rocket…
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