NASA's Unexplained Files: The music that Apollo 10 astronauts heard on the 'far side of the moon'

In 1969, the United States launched Apollo 10 into space: its fourth manned mission, and the second to orbit the moon.

In 2008, four decades after that mission, recordings of what the astronauts heard on the far side of the moon were, well, unearthed. The video above from the Science Channel on YouTube is from a series called NASA's Unexplained Files.

A more recent space exploration by the Cassini aircraft too picked up similar noises around Saturn, but while those could be explained as being caused by "charged particles moving through Saturn's magnetic field", that explanation does not apply to what the astronauts heard on the far side of the moon.

Kevin Grazier, a planetary scientists says, "The moon doesn't have an atmosphere or a magnetic field".

While one scientists here says the two radios on the spacecraft were interfering with each other and causing that noise, that hasn't been accepted as a plausible explanation, and the noise continues to be a mystery.