Why Is Space Completely Silent?

💡 The Answer

• Sound travels as vibrations through a medium like air, water, or solid material
• Space is a near-perfect vacuum with almost no molecules
• Without molecules to vibrate, sound waves cannot propagate
• Astronauts communicate using radio waves, which are electromagnetic and do not need a medium
• Inside a spacecraft there is air, so astronauts can hear each other normally
• Some space phenomena produce radio emissions that scientists convert to audible sound for study