4 rockets on launch pads at the same time for 4 booms? Posts at 1:30 and 1:36 are pretty interesting to read. Links in comments.
(media.greatawakening.win)
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Yes, I'm also aware that the project was originally set to launch in 2018.
Remember, NASA gets 50 million per day, they need something to justify their continued existence.
Huge delay due to Friction Stir Weld process. When you have to invent technology to create necessary components, expect delays. And never neglect to figure in the human factors, as irritating as those are.
https://www.youtube.com/watch?v=XM825iLaPvU
The Liquid Hydrogen tanks, and Oxygen tanks are made from nearly 1' thick sheets of aluminum. This process allows these materials to be welded, without thermal expansion, bubbles, or additive materials.
Then we have the computer models that were used at various sites, using Real Time OS (Artemis - yeah, not very creative here) and Maestro (User input and output computer) to model the Artemis SLS, individual components on the space craft, as well as the test sites (Stennis, Michoud and KSC), weather conditions during launch, pressurization and filling of the tanks, etc. etc.
Now throw in the COVID mess into this, launch windows contingent upon lunar breaking, orbital debris, weather and trying to maximize orbital time (to stress Orion). There is a bit to it.