I saw a thread on this subject, but it's very old. Let's refresh the memories.

" Apollo 14 astronaut Dr Edgar Mitchell, said he was aware of many UFO visits to Earth during his career with NASA but each one was covered up.

Dr Mitchell, 77, said during a radio interview that sources at the space agency who had had contact with aliens described the beings as 'little people who look strange to us.' "

[link to www.dailymail.co.uk]

If he is not lying, that's a world changer. If he is lying, well...