Every moving visual or animation is about to make noize (less often or not at all in space, but we live on earth mostly :-D)

And it's not only put a sound thal will make the identity of a universe (not space but a contexte ;-)) or the intention of an action. If someone is beating his iced meat to train himself at boxing, if you close your eyes and you imagine a man who is running for is training of boxe, there is a problem!

So there is where a good sound editing and sound design become important.

Video Editing