Here’s an overview of “space sounds”, i.e. naturally produced radio signals from the planets, deep space, meteors, etc converted to audio: The spooky sounds of space:  Since the 1950s, probes sent into space have been sending back data that reveal eerie sounds from the vastness of the galaxy. - CNET.

Find more space sound resources in the Natural Space RadioNatural Space Music, and Natural Space Sounds sections at HobbySpace.