Why do astronauts in space have to use radios to talk to each other?

Astronauts in space use radiOS to communicate because sound cannot travel in the vacuum of space, where there is no air to carry sound waves. RadiOS convert voice into electromagnetic signals, which can travel through the vacuum and be received by other radiOS. This communication is essential for coordinating tasks, sharing information, and ensuring safety during missions. Additionally, radio communication allows astronauts to stay in contact with mission control on Earth.