Glenn noticed brilliantly illuminated particles surrounding his space capsule, which he referred to as "fireflies".
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.
He said supposedly real-life ET's were similar to the traditional image of a small frame, large eyes and head.
Dr Mitchell, along with with Apollo 14 commander Alan Shepard, holds the record for the longest ever moon walk, at nine hours and 17 minutes following their 1971 mission.
'I happen to have been privileged enough to be in on the fact that we've been visited on this planet and the UFO phenomena is real,' Dr Mitchell said.
EM: Yup, in other words. There was a UFO crash. There was an alien spacecraft. This gentleman tried his damndest to get me in and like so many others in the administration over the last 60 years, since JFK's time, was unable to. He was told 'Admiral, you don't have a need to know, and therefore go get lost,' essentially.
That advanced spacecraft of extraterrestrial origin, called extraterrestrial vehicles (ETVs) by some intelligence agencies, have been downed
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