UPDATE: Launch scrubbed, min engine trouble. Earliest next launch opportunity is September 2.
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The 2-hour launch window opens at 8:30 AM Monday morning, Eastern time. Should be streamed live here:
Also here:
The SLS is an insanely expensive, ridiculously obsolete design, but damn if I don’t hope it succeeds. I did some work on those boosters back in the day… fifteen friggen years ago. Youch.