I Need to Be Intellectually Stimulated

Dark matter is surmised to be there because the visible Universe only has about 5% of the matter necessary to account for the velocity of the expanding Universe. It's possible that they are all wrong about the nature of Gravity and the expansion of matter. Our minds only have limited capacity. How many years did scientist believe that there was no spiritual existence. When you're, you're dead. No afterlife.However with the development of knowledge of Quantum Physics. They are no longer certain.