First SLS Launch Slips to August 2022 or Later | NextBigFuture.com
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Summary
This would be a budgeted $4 billion per SLS launch.Ancient RS-25 EnginesDesigned and built by Aerojet Rocketdyne of Sacramento, California, RS-25 engines helped power the space shuttle over three decades through 135 missions, accumulating more than 3,000 starts and one million seconds of ground test and flight operation time. Fourteen flown engines and two new engines from the shuttle program will be adapted for use on the first four SLS missions.SpaceX has launched the Falcon 9 seventeen times so far this year.
As said here by Brian Wang