NASA Astronauts in space have heard the mysterious music and kept it secret 50 years

Only now declassified records management NASA talks Thomas Stafford, John Young and Eugene Cernan - crew "Apollo 10," has committed a test flight to the moon in 1969. Site astronauts for an hour heard strange music, like a melodious whistle.
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Whatever it was, the astronauts recorded
But it is interesting that a few months later, Michael Collins, pilot of "Apollo 11", hear exact same sounds.


via www.nat-geo.ru/universe/846688-astronavty-nasa-slyshali-v-kosmose-zagadochnuyu-muzyku/