Unless I can see a scientific explanation of how the rocket walls protect the occupants from radiation over the 3 day adventure, then it must be BS.
The Space station floats around behind the earth, so is never in direct line to the sun. Its in the Earths shadow.
Mabe its possible for the Moon landings to have taken off from earth on a tradjectory that keeps the rocket in earths shadow from the sun for the voyage to the moon and back.
