photo by Kent McDonald, fubiz.net

It's a well-known fact that sound can't be carried in the empty vacuum of space - there just aren't any molecules for the audio vibrations to move through. That is true, but only up to a point. Space not a complete void, though large swathes of it are. Interstellar gas and dust left behind by old stars does have the potential to carry sound waves. The particles are so spread out, and the resulting sound waves are of such a low frequency, that they're beyond the capabilities of human hearing. sciencealert.com

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