>>13020493Dark matter is a theoretical substance that is not confirmed to exist but it is used as a potential explanation for errors in calculations regarding gravity that do exist.
Effectively speaking, the movement of galaxies in the universe is not in accordance with the laws of gravity as we currently know them.
Calculations were run from our known model of gravity that produced "expected from visible disk" but the actual observed phenomenon was the line on the graph that seems to be increasing rather than decreasing.
These observations are impossible unless there was more matter than detected in the galaxy. So the theory is that there is invisible matter that produces no known way of detecting it except gravity alone. The name "dark matter" was chosen because if it exists then it is likely some kind of matter that is invisible or "dark," to us in every way. Nobody has detected it, they have only detected wrong numbers of gravity in space.
Antimatter is confirmed to exist, it is far less common than "regular matter" and antimatter causes a massive explosion when it comes into contact with matter. It is such a dangerous substance that it is only used in very small amounts and it is too expensive to store in large amounts because it is just too explosive to gather in large amounts.
