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