Star Wars IV: A New Hope- Hollywood Critic

In all of the Star Wars movies there are often fight scenes in space where things are exploding. I am doing this Hollywood Critic side-quest because it is not possible for those explosions of planets, space ships, and battle stations. In space, things cannot explode. For one, fire can not be in lit in space making everyone incapable of lighting anything that requires fire to explode. In Star Wars, the lasers that are the cause of most of the explosions, follow the principles of magneto-hydrodynamics, which allows them to fly through space destroying things. Now talking about explosions. In space, if something were to be tempted to explode, it would not, because there is a lack of oxygen in space for fire to combust and go out everywhere, which if it could not explode it would implode, or collapse, on itself. So all of those ships, planets, and asteroids in Star Wars should have been falling inwards on themselves instead of exploding into many pieces. Also to include with explosions, you would not be able to hear in space because sound is absent in the vacuum of space.