Question

An explosion occurs on the moon.will it be a)seen b)heard on the earth instantly or after sometime?

Answer 1

In any case, it's impossible to hear it from the moon on the earth as sound waves cannot travel in vaccum as they need a medium to travel. And, the explosion can be seen on instantly on earth.

Answer 2

If an explosion occurs on the moon, it will be seen after approximately 1.2 second, but not heard because there is no air on moon