As I promised: Dark matter is a form of (I think matter) that is "invisible." It dose not react with anything in the universe, but we know its there because it has gravity. Following Einsteins theory, space can bend light(the only part of this theory that is actually true), we can see light from galaxy's that is bent by other galaxy's. Witch plug it into an equation you will see the light bent a lot more that the matter we can see can. So this dark matter has gravity. With out this dark matter, nothing would form. No earth, no solar system, no milky way, and no other galaxy would be here.
Dark matter passes through your body all the time, and it can because, again, it doesn't react with matter. So proving that it exists is a vary hard task. You have to record it passing through matter without accidentally picking up background noise(radiation).
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