Why dark matter does not emit photon?
We are now living in the era of new revolution. Are we again treading on the process of huge revolution that occurred in the late 19th century and the early 20th century? The current observation of dark matter requires explanation on two important situations as the following. Situation 1: Denial of the gravitational (attractive) phenomenon Dark matter is five times more than the general matter, but it does not show macro-structure like the structure of galaxy or galaxy cluster, or micro-structure like fixed star or planet. The result of the current observation is that dark matter has attractive interaction with the general matter, but does not interact with the other dark matter. In other words, the observation or interpretation is that dark matters do not exert gravity on each other. Situation 2: Denial of the fundamental phenomenon of physics that absorbs or emits photons It is not the level that dark matter has not interacts electromagnetically because it is electrically