Dissipation of light?

[magister_negi_magi]

While at the mall today, listening to all the chatting and other sounds, a thought crossed my mind. When you yell, or create any sort of sound, the sound wave continues to travel until you can't hear it anymore, right? So can you apply this principle to light? Does light have a finite distance it can travel, where it then dissipates into nothing(Or maybe into something else, I'm not quite shure.)? Or does it just travel forever, assuming it isn't stopped by anything? Stuff like this crosses my mind on a daily basis, and this is the first time I've decided to share. Thoughts?