Are we all silent?

Yes. You heard that, didn't you? Well, you and me… could ALL theoretically be silent. After all, waves are pretty much just illusions that are formed by the mind. And this applies to just about any kind of wave, whether that involves light OR audio! How could this be possible? Again, this is just a theoretical thing.  However...
The reason that I wanted to write about this is that I've heard an intriguing thought before. How is it possible for us to be silent? It could be that those who live beyond Earth might just not have any hearing.  

 And as always. Stay interested my friends.