Man on the Moon: Astronaut Buzz Aldrin salutes one of the US flags planted during Apollo missions to the lunar surface.Courtesy NASA via WikipediaBack in the late 60s and early 70s, during the Apollo lunar-landing missions, astronauts planted a US flag at each landing site. Now, forty years after Apollo 17 became NASA's last manned flight to the moon, scientists, studying images supplied by the Lunar Reconaissance Orbiter (LRO), have determined that all but one of the planted flags are still standing. Click here to learn more, and to find out which flag has fallen over and why.