NASA fuels moonrocket for 1st time in countdown rehearsal
This was NASA's fourth crack at the all-important dress rehearsal, the last major milestone before theThe previous attempts in April were thwarted by a fuel leak, as well as stuck valves and otherAnother leak—this time in an external fuel line—almost curtailed Monday's test at Kennedy Space Center. But NASA managers decided to do the countdown test anyway.
Engineers wanted to get all the way down to the 9-second mark—just short of engine firing—to validate all the systems and procedures. But it cut off at 29 seconds. NASA spokesman Derrol Nail said it wasn't immediately known why the countdown stopped. Earlier, nearly 1 million gallons of super-cold liquid hydrogen and oxygen were loaded into the 322-foot rocket known as the Space Launch System, or SLS.
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