"A causa dello stesso effetto, nelle foto con l'astronauta che esce dal LEM il suolo alle sue spalle, ovvero nella direzione opposta al sole, sarebbe apparso più luminoso rispetto a quello di lato [...]"

"Qui una pagina che tratta in modo dettagliato del di questo fenomeno luminoso sulla regolite lunare:
http://the-moon.wikispaces.com/Retro-Reflection+phenomena"

"The ability to sometimes see detail in the shadowed parts of an Apollo astronaut's suit while walking on the Moon has sometimes been attributed to the shadowed part of the white suit receiving retro-reflected light from the bright Lunar Heiligenschein around the astronaut's shadow on the retro-reflective regolith. A typical Hasselblad photograph which shows the "not shadow-like" or "not dark shadow" on an Apollo astronaut's suit is AS16-117-18825 (Apollo 16's John Young, near the Lunar Roving Vehicle). But this explanation cannot be correct for several reasons. The light from the opposition surge on the lunar soil is not like the beam from a flashlight. Even if the reflected light were 50% stronger than normal over a 5° angle, that little zone is no more than 0.4% of the total hemisphere into which light is reflected and hence it augments the overall reflectivity by only about 0.2%."