Just a quick question. At first I was really baffled by the idea of a "free return trajectory" for a mun landing mission. To me, this meant you have to land and get back into orbit to catch your ride home VERY quickly (is this even possible without stupid amounts of fuel?). Can someone confirm that a "free return trajectory" is not actually completed for a mun landing mission and that Apollo simply started out with one for two reasons: 1. safety - if something went wrong you just wait and go home again, 2. speed - as previously said to make eating and breathing easier. That once near the moon, a free return trajectory is simply abandoned and the orbit circularized. The idea that you can return to a free return trajectory is false as you've used fuel to do so and hence isn't free.
