Here's a brief rundown of the major Artemis 1 milestones, both before and after its Aug. 29 liftoff.
and the SLS core stage, among other tasks. That evening, about 12 hours before liftoff, all non-essential personnel will leave Pad 39B. Around that same time, the team will activate the mission's ground launch sequencer , a software program that automatically manages the final portion of a countdown.
Those final 10 minutes will be jam-packed with milestones, including the switching of Orion and both SLS stages to internal power and the termination of propellant replenish activities. Finally, at T-10 seconds, the GLS will send the command for the SLS core's four RS-25 engines to start up. That will happen at T-6.4 seconds, and the Artemis 1 stack will rise off Pad 39B when the countdown clock strikes zero.
that it must deploy. Those cubesats will perform a variety of work in deep space, from studying how radiation affects yeast DNA to hunting for water ice on the moon. According to astrophysicist and satellite tracker Jonathan McDowell, those cubesats willthree hours and 40 minutes after launch, and the last of them will be flying freely by about T+8 hours.
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