From educlick
The tendency for the peak luminicense sensitivity of the eye to shift toward the blue end of the spectrum at low illumination levels as part of dark adaption. In consequence, reds will appear darker relative to other colors as light levels decrease, Simply the reason is Purkinje effect.
The obvious reason is the capacity of rocket. Since we use conventional chemical propulsion system , even in space we relies on solar power & chemical power for our spacecrafts. Thus it requires huge amount of fuel to go directly to moon against the gravity of earth and of course sun. But in orbital motion , we are assisted by the same gravity to boost our craft speed to such level to be able to the moon.
UTTER 