Image of Plum Crater on the moon, investigated by Apollo 16 crew, with luminous UFO in black sky at top right.
"...all Apollo and Gemini flights were followed, both at a distance and sometimes also quite closely, by space vehicles of extraterrestrial origin - flying saucers, or UFOs, if you want to call them by that name. Every time it occurred, the astronauts informed Mission Control, who then ordered absolute silence."
Maurice Chatelain, NASA
NASA Source: http://history.nasa.gov/40thann/humanspf.htm
