Now days there are a lot of ghost hunter progams on TV. It seems like every few weeks an new gang of ghost hunters has hit the streets roaming around old homes and ships looking for ghosts and claiming to find proof of same. Thus the question, if ghosts are real what kind of matter would make a ghost. Remember ghosts are supposed to be able to go through doors, walls, etc. So I pose the question, what kind of matter could make a ghost and why?