![Astronauts](https://assets.shortpedia.com/uploads/2022/10/04/1664864506.webp?tr=w-1200,h-600,cm-pad_resize,bg-F3F3F3)
Sound waves can only move through solids, gases, and liquids; they cannot travel through vacuum. Space has no medium for sound waves to travel through, and it is completely vacuumed. As a result, astronauts in space cannot hear or communicate with one another. To listen and communicate, they need a radio.