Question

there may be many explosion and noises taking place in the outer space but we normally do not hear them why

Answer 1

This is because, sound needs a medium to propagate and in the space there is vacuum and as a result there is no such medium for the propagation of sound and that's why we don't hear the sound of the explosion in the outer space.

Answer 2

Answer:

Because sound needs a medium to propagate and in the space there is is vaccuum.Therefore we are unable to hear many explosions taking place in the outer space but we do not hear them.