First, I'm not supposing anything. It has been proven by NASA that sound can and does travel through space. These sounds are not audible to us because they are at such low frequencies that we are not able to detect them with our ears.
This isn't a scientific debate but a debate about the audible voice of God. But since you insist.
Can you hear sound waves in space?
The following is copied off the net:
"NASA Actually Recorded Sound In Space, And It’s Absolutely Chilling
Interesting
Can you hear sounds in space? Now you’ve probably heard that there’s no sound in space, but
technically that’s not true.
Now yes, space is a virtual vacuum….. However, sound does exist in the form of electromagnetic vibrations that pulsate in similar wavelengths.
What
NASA did was design special instruments that could record these electromagnetic vibrations, and transferred them into sounds that our ears could hear."
Notice that part about technically that's not true. It lead to the follow spot on the net - which I copied for you:
"Sound travels in waves like light or heat does, but unlike them, sound travels by making molecules vibrate. So, in order for sound to travel, there has to be something with molecules for it to travel through. On Earth, sound travels to your ears by vibrating air molecules. In deep space, the large empty areas between stars and planets, there are no molecules to vibrate. There is no sound there."
Now I decided that because I already pointed out that according to the Bible men go to and from and knowledge is increased, I figured I'd take a moment to go back and forth with you, but it really is not what the OP is about. So in the above we see there are electromagnetic vibrations the pulsate in similar wavelengths, and NASA could and did make an instrument to transfer them into sound that our ears could hear, but if they had to be transferred then they are not sound waves. So perhaps technically you can say that there is sound in space but it is not audible to us. So it is sound waves, considering that sound travels by making molecules vibrate? No, you can't hear them with your ears, but NASA can transfer them into sound that you can hear.
Now, according to the Bible God spoke and things were created. Was is in audible sound waves, since there was no air? It could be that He caused electromagnetic vibrations, but I'm not saying He voice is that. I'm not sure how I pick up His voice, but it is not sound waves, that if for sure. Though I have heard His voice come across loud enough to me where I thought it was sound waves. But since God said He voice was spirit, and I don't think He is a liar and I do think God can be trusted to say things correctly, then His voice is not in sound waves. Perhaps it is electromagnetic vibrations or something similar, but I doubt it! NASA might have picked up something. I don't believe God's voice is of this physical realm at all.
The problem I run across, is that people (even me) tend to think in physical terms instead of spiritual terms. If fact I believe that is exactly the reason Jesus asked and told the Pharisees that they didn't understand what He was saying because they didn't hear His words. Why are some posting here not understanding what I am saying?
Jn 8:43 Why do you not understand what I am saying? It is because you cannot hear My word.
I believe that if any person was indeed hearing the Lord's voice everyday that is called "Today" then they must sure understand that He is not talking to them in sound waves!! So to correctly understand the Bible you must listen to Him and learn from Him! Leaning on your own understanding and a person's experience in the physical realm would lean a person to thinking God spoke to Saul with a audible voice, but those with him picked up something but not the words spoken, And those at the mountain with Moses heard something, certainly something like thunder, but Moses explained to them that God had not given them ears to hear. I don't think Moses lied to them. God had not given them ears to hear. So when the other prophets in the Bible talk about hearing from God was it by sound waves or by the Spirit of God?
I do believe God could, kind of like NASA, transfer His voice into sound waves that we can hear, but since Jesus specifically said His words are spirit, and I don't believe Jesus was wrong, His words must be spiritual words not sounds waves. That would explain why those with Saul did not hear the words Jesus spoke to Saul on the road, and why Moses had to explain that they had not yet been given ears to hear, and allsorts of other things in the Bible.