in fact i think there is sound in space i use the word sound very loosely
gravity from the moon causes waves to occur on the surface of the earth the water gets pulled it hits its peak point and it subsides and so on which causes the water to slosh about a tiny bit
if you had a sensitive enough device eg say a laser pointed towards a object that is free from the laser housing that was closer in orbit of eg ?earth? as the different density's of magma moving closer and then moving away would cause the object to get pulled closer to the earth a bit faster than the laser over time you would see a wave effect as the object accelerates then stops accelerating and so on
think of to objects in space like having a spring having a microphone held against the object the spring is attached to and having a magnet held right at the point where its pulling the spring but its not going to make it hit it and then getting a smaller magnet and move it back and forth behind the big magnet and u should see the spring get pulled closer a tiny bit every time to little magnet gets closer to the spring and you would see a register of sound if you could say make the little magnet move to the same rhythm as a music track well you get the idea
see sound is possible in space in a sense