Question

why we can't communicate in the space while b can do it on earth​

Answer 1

Explanation:

because the space is back and there is no atmosphere in the spirit and hence sound waves can travel in the space and consequently we are not able to hear

Answer 2

Explanation:

Because there is nothing out in space like an atmosphere, so the sound waves from one astronaut's speaking can't travel over to the other astronaut's ears. That's why the astronauts use radios to communicate even if they're floating in space right next to each other.

Hope this helps you.