I wonder why we can hear sound underwater then? Or through solids?
You don't need air molecules, sound is just a vibration of pressure that can travel through most forms of matter (solid, liquid, gas). Most of space is a vacuum, hence no sound. My original point wasn't about the matter needed in space, but the actual space itself. When the Big Bang happened, there was no space for sound to travel through.
You don't need air molecules, sound is just a vibration of pressure that can travel through most forms of matter (solid, liquid, gas). Most of space is a vacuum, hence no sound. My original point wasn't about the matter needed in space, but the actual space itself. When the Big Bang happened, there was no space for sound to travel through.
