At least one version of Robert Zubrin's Mars Direct[1] plan calls for attaching the crew module to the booster stage with a tether and then spinning them to pro

At least one version of Robert Zubrin's Mars Direct[1] plan calls for attaching the crew module to the booster stage with a tether and then spinning them to provide artificial gravity. This diagram is a good visual explanation: https://spectrum.ieee.org/ns/slideshows/06W_Slide_GoToMars2/fullscreen/06w.gtm.f4.jpg https://spectrum.ieee.org/ns/slideshows/06W_Slide_GoToMars2/... [2]. [1] https://en.wikipedia.org/wiki/Mars_Direct https://en.wikipedia.org/wiki/Mars_Direct [2] Slide 4 from https://spectrum.ieee.org/slideshow/aerospace/space-flight/slideshow-how-to-go-to-marsright-now https://spectrum.ieee.org/slideshow/aerospace/space-flight/s...