In Space, No One Can Hear You Lie?

Following up on Space Farce? The educational section regarding our titled question:

Sound travels through the vibration of atoms and molecules in a medium. Sound is what the brain produces when our ears detect vibrations in the air.

Baryonic matter (gas, liquid, solid) can carry sound. Sound waves can only travel through a medium if the length of the sound wave is longer than the average distance between the particles. 

Shortly after the "big bang", the matter in the universe was still densely packed enough that sound waves could travel through it.  After 14B years of expansion, not so much to propagate sound wave upon?  

Do black holes make sound? The material collected in the accretion disk of a black hole is dense enough that sound (as we know and hear it in our limited hearing range) can exist.  And what of all this jabberwock about dark matter?

Even if dark matter is "there", if it lacks gravitational interaction or electro magnetic force interaction, then sound waves cannot propagate. But what if dark matter self interacts?

Sometimes sound waves are created, and we are not be able to hear them. Why?  Refer back to the frequency of the wavelength and the average distance between particles in the medium, creating a vibration.

Although there might be a vibration, said frequency is on a scale that our ears, and current instrumentation cannot measure.  Thus, lacking that vibration, or the ability to sense or hear its frequency or wavelength... 

In space no one can hear you scream, pew-pew or lie. 

Recommended reading: There Actually Is Sound In Outer Space

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