It doesn’t exist. Just like cold and darkness don’t. Cold is simply lack of heat; darkness is lack of light. Quiet is lack of sound. It’s possible to attain true cold (Absolute zero) and true darkness (light happens to get sucked into black holes), but is it possible to reach absolute silence?
Research shows that it isn’t.
At least, on the earth.
Go to a quiet room somewhere in your house. Is it quiet? Naw. You can hear the heater. Clocks. And if you try really hard, you can probably hear the cars on the road outside.
Now try going to a remote location in the woods. Is it quiet there? Nope. Trees rustling in the wind. Animals scurrying across the dirt floor, shifting the plants they brush up against.
Where else is it quiet?
Some scientists created something called an Anechoic Chamber. Its walls, ceiling and floor are lined with sound-absorbent material. They say you’ll go crazy within an hour by just sitting there–it’s completely devoid of sound. But is it really?
Upon entering one of these rooms, composer John Cage observed that it wasn’t truly quiet. He claims he heard a low hum and a high-pitched whine. These actually turned out to be his cardiovascular and nervous systems, respectively. So even in a room that’s supposedly devoid of sound, you’ll still be hearing things.
Apparently space has sounds, too. But I don’t know as much about that. How can a vacuum carry soundwaves?
Why don’t you stick your head outside a space shuttle and find out? 😛