I am having a debate with my brother. He reasons that when he turns off the light it is no longer there. You cant see headlights when you turn them off or a lighters light bouncing around the room when you turn off the lighter. So where does it go? He reasons that since you cant see the light anymore its just gone and it no longer exists. So when a star explodes its light doesn't keep going toward us on earth for billions of years. So scientists are wrong and light just disappears when a star explodes. What is his flaw in LOGIC? I cant seem to think of how to refute him. Its a good point but he's clearly wrong.