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Actually, as a correction to the above, the sound waves themselves may, in fact, go further. The lack of matter is precisely why we cannot hear them. The tiny hairs that detect sound detect it do to vibrations caused by particles moving near and across them. If you had a sound system in space, you may not hear it well, but if you touched it (assuming it could play with the lack of atmosphere, which i don't believe such a system exists), you'd still "hear" it much like you hear yourself even when you aren't making fully audible noises... the vibrations are now moving THROUGH you to your aurotory system.
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