Sound Waves in the Interstellar Medium

Sound waves in the interstellar medium

A) cannot travel through the gas.
B) travel so slowly that they are undetectable.
C) can travel through the gas, but the very low density of the interstellar medium makes them inaudible.
D) travel extremely quickly and are therefore very loud.
E) can travel through the halo interstellar medium but not the disk of the galaxy.

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