WATCH: classified NASA tapes reveal ‘unexplainable music' on the moon

Apollo 10 astronauts heard strange things on the dark side of the moon.

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Sure, you've probably heard about a lot of alien conspiracies, but this recording of aliens is just something else.

In 1966, the crew of the Apollo 10 were taking part in the "dress rehearsal" for the first moon landing. Their mission was to test the equipment that would be used during the descent.

The tests involved orbiting the moon and travelling to the far (dark) side of it - a place where the sun doesn't shine and spacecrafts are out of radio contact with Houston for about an hour.

But despite not being able to live-communicate with the mission control office, the equipment onboard the spaceship still recorded everything that was happening on the craft.

And it’s now been revealed. The previously-classified taped recordings contain ‘strange, otherworldly music coming through the Apollo module’s radio. When they were outside of radio contact with Earth.

Spooky, huh?

The astronauts were apparently so surprised that they didn’t know whether or not to report it to NASA.

The unexplained “music” transmission lasted almost an hour, and just before the astronauts regained radio contact with Earth, it disappeared.

NASA engineers obviously claim that the sound was simple radio feedback, but Apollo 15 astronaut Al Worden doesn’t agree with this.

"We’d had a lot of incidents where guys who flew in space saw and heard things that they didn’t recognise, and you wonder about all of that," he said.

"I have a very open mind about what could’ve happened."

Perhaps it really was aliens, playing their Space Top 20 charts?

Feature image © iStock