NASA will attempt to fire the engines on its Space Launch System (SLS) megarocket for the first time today and you can watch the fiery action live online.
Watch live: NASA to test-fire 1st Space Launch System megarocket core booster today
NASA says it now expects to test-fire the four main engines of its first Space Launch System core booster "within an hour" (possibly by 6 p.m. EST/2300 GMT). Read more.
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