StartsWithA BangBlog discusses if you could hear the big bang...
The very early Universe has density fluctuations at all scales, meaning that it will produce sound waves at all frequencies. In fact, you can still see this "white noise" just by grabbing an old television with rabbit ears and turning to channel 3. A significant portion of the "snow" you see on your TV set comes from the Cosmic Microwave Background.
so early after the big bang, there was enough "stuff" to vibrate and carry sound waves...if your ears were around to hear the sound..
more HERE
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