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In the movie, First Man Neil Armstrong and his colleague David Scott, as part of the Gemini 8 program, attempt to dock with the Agena. But it turns out to be disastrous as they go into a continuous roll over.

My question is:

  1. What is the need for docking with the Agena and then later undocking so as to land on the moon in a smaller vessel? Why can't there be one rocket which takes the passengers, lands as a single unit and then comes back (much like how an airplane is) without docking and undocking? Wouldn't that be easier?

  2. What caused the continuous roll over and how did the RCS Brakes help in the stabilization of the vessel?

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closed as off-topic by Mike G, Glorfindel, PM 2Ring, Jan Doggen, peterh May 3 at 18:48

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    $\begingroup$ Off topic, try Space Exploration SE $\endgroup$ – Mike G May 3 at 15:18
  • $\begingroup$ different but related question in Space SE Agena docking and RCS Brakes in First Man I think you might have posted in Astronomy SE by accident, I've done that once or twice myself. $\endgroup$ – uhoh May 4 at 0:04
  • $\begingroup$ In regards to your first question, see this question on Space.SE for why they picked the "lunar orbit rendezvous" mission profile over the "lunar direct ascent" profile. $\endgroup$ – Mark May 7 at 2:14