Wherever you are listening to this podcast, be it in your car or tucked into bed, turn up the volume as we explore some of the most mysterious sounds ever recorded.

We have microphones everywhere, I bet there is one within arms reach of you right now. There is also a microphone some 17,922,521,702 km away. It isn't a microphone really. It is an instrument that enables us to hear some physical processes occurring in the interplanetary media as well as in the magnetospheres of the giant planets.

This listening device is aboard Voyager 1 and 2, exploratory spacecraft sent to explore the outer planets and our solar system.

Here are some sound recordings courtesy of Voyager 1 and 2.

Now what you may find interesting is that we included sound on the spacecraft as well. The idea was, if the craft were detected by extra terrestrials, they would be able to listen to us. Aboard each spacecraft is a golden record, a collection of sights, sounds and greetings from Earth. There are 117 images and greetings in 54 languages, with a variety of natural and human-made sounds like storms, volcanoes, rocket launches, airplanes and animals. There is even a recording of Chuck Berry's Johnnny B Goode to entertain the aliens.

And then there are the brain sounds.

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