hi every body, i'm new here abouts i have a question that has been puzzling me... if a flash of light was 'let off' in a mirrored sphere, how long would the light be there for? would it be forever reflected internally? if not why not? would you be able to crack open the ball some time later and see the flash? after all we know that light can travell for billions of years, but what about in a confined space?