Question

Imagine two astronauts working on the outside of a space station. One yells instructions to the other astronaut. Why can't they hear each other?

Answer 1

No you cannot hear any sounds in near- empty regions of space. Sound travels through the vibration of atoms and molecules in a medium (such as air or water). In space, where there is no air, sound has no way to travel

Answer 2

There is an empty space, or sounds must travel through matter to make a sound