There's no wind on the lunar surface; all flags planted there are in a perpetually frozen "wave." On the Apollo 11 mission, the astronauts planted the flag too close to the landing site, and Buzz Aldrin later said that he saw the flag they had erected topple over after being violently buffeted by the engine blast as the lunar module ascended from the surface. Since then, all flags have been planted further from the landing and launch sites.