When a radio telescope listen to the Universe; a constant sound is recorded. Is it the noise "of the mic" : interferences? Scientists says that when they will notice variations on this basic constant same noise I call "the interference coming from the mic" they will conclude on an extra terrestrial source of sound; but in fact if is waves that are "listen" to. So, any news?
Space is not quiet at all and is actually very noisy when listening via a radio telescope. There are many sources of radio emissions in the universe, with pulsars being a very common one. They can be quite interesting to listen when the signals are converted into sound frequencies we can hear. They range from slow clicks every few seconds to high pitched buzzing.
Here's a link with some examples: http://www.parkes.atnf.csiro.au/people/sar049/eternal_life/supernova/pulsars.html
When using a wide angle antenna or one that uses a wide band of frequencies the mixture of all these emissions at once would just sound like background static.