reply to post by lively
I read somewhere that the - I'm sure I'm about to misuse terms here - leftover three degrees above absolute zero cosmic background microwave
radiation, that they currently like to cite as the lingering echo of the big bang, could, if you were so inclined, be expressed as a musical note,
again misusing my memory to say, C ten to the 21st power below middle C on your piano keyboard, something of that flavor.
Presumably if you were to gin it up to modulate a tone coming out of a speaker that was in our human range of hearing, it would sound like either
"hisssss" or "Ommmmmmmm", right?