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Re:Earth Restored – 50 restored images of earth released by astroflask on Saturday April 24, 2021 @08:06AM (#26924297)
For SLS a group looked into making boosters powered by modernized F-1's... Turns out a lot of knowledge about welding them had been lost. They managed to get an old unflown F-1A to work, but it's a bit unclear how much they managed to do with the new design, the F-1B. Wikipedia[0] has a few details and some links, but it falls short of telling the end fate of this effort.

Obviously, the F-1B booster wasn't picked for the SLS and they went with the improved 5-segment SRBs[1].

[0] https://en.wikipedia.org/wiki/Rocketdyne_F-1#F-1B_booster

[1] https://en.wikipedia.org/wiki/Space_Shuttle_Solid_Rocket_Boo...

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