Dark Matter

Form of matter that exists of particles which don't emit any (electromagnetic) radiation, making it invisible and hard to detect. Some physicians think that dark matter can function as an energy source for starship drives. Dark matter exists in the Mar Obscura nebula. In Star Trek, dark matter seems to have some exotic properties. It makes objects continually phase in and out of our universe. This property can cause depressurization on board of starships, because the hulls phase in and out.