Кстати, я покопался в википедии и так нашел возможное объяснение движению флага: There is some evidence that the Moon may have a tenuous atmosphere of moving dust particles constantly leaping up from and falling back to the Moon's surface, giving rise to a "dust atmosphere" that looks static but is composed of dust particles in constant motion. The term "Moon fountain" has been used to describe this effect by analogy with the stream of molecules of water in a fountain following a ballistic trajectory while appearing static due to the constancy of the stream. То-есть имеется слабая пылевая атмосфера. https://en.wikipedia.org/wiki/Lunar_soil