NASA has finally released the creepy 'space music' astronauts hear on the dark side of the moon.

NASA has finally released the creepy 'space music' astronauts hear on the dark side of the moon.
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When NASA astronauts circled the moon on the 1969 Apollo 10 mission—the final "test run" mission before the first moon landing later that year—they heard strange, whistling, musical noises while their spacecraft flew around the far side (often called the dark side) of the moon. Since there's a Moon between any spacecraft and Earth during this portion of the flight, Apollo was receiving no signals from anywhere but space. Now, after more than 40 years, the Discovery Science show NASA's Unexplained Files uncovered the recording of that "music," which was buried deep in NASA's lengthy historical archives (though technically available to the public). Take a listen:

"The music even sounds outer-spacey, doesn't it?" one astronaut even says. "You hear that? That whistling sound, 'wooooo'?"

Here's the disappointing part: the sound apparently has nothing to do with aliens. Though the crew at the time couldn't explain the noises, NASA said later that the sound was caused by interference between the two radios in the lander and orbiter modules of Apollo. Suuuure, if you believe NASA. (Editor's Note: We believe NASA.) Conspiracy theories still continue to abound, as they will.

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