The dark matter, including neutrino, can be found in a spread over cosmic space state of the gravity related systems. It can exist only due to motion of the particles at specified values of speed. Since at present time there is no significant room to doubt the generality of the gravity lows, it is reasonable to assume that the lows of motion for the objects belonging to the dark matter are the same as for other cosmic objects independently of their nature, like stars, planets, asteroids, cosmic dust and so on. So far the study of the dark matter is in its inception phase and there are many gaps in available information and knowledge framework. Nevertheless a number of properties of the dark matter can be defined with appropriate confidence. Some of them are discussed within this paper.