Apollo 10 astronauts “heard weird music on far side of moon”
23 February 2016 Last updated at 22:53 GMT
Nasa has released the audio of the conversations Apollo 10 astronauts had upon hearing what they called “outer space type music”.
Apollo 10 astronauts reported hearing strange noises during their 1969 mission.
Crew members Eugene Cernan and John Young are heard discussing the sound while they were flying on the far side of the moon.