Dr. Edgar Mitchell, former NASA astronaut and moon walker, has revealed aliens exist. And he says extra-terrestrials have visited Earth on several occasions, but it has been repeatedly covered up by governments for six decades. Dr. Mitchell, who is 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.' He also claimed that our technology is "not nearly as sophisticated" as theirs and "had they been hostile", he warned "we would be gone by now".