On July 21, 1969 the first human walked on another world. On December 14, 1972 the last human walked on another world.
"If we can put a man on the Moon" is a phrase we use to describe our capacity to achieve great things. Sadly, we may soon be entering a period when there is no living human who has walked on another world. 12 people walked on the Moon. As of this writing, only 4 are still alive, and the youngest is 82 years old.
This photo has always been an inspiration to me. I hope we will always have humans alive who have walked on other worlds.