Many people on here seem to lack correct understanding on why scientists postulate (theororize) the existence of "Dark Matter". There is only one reason scientists believe that it exists, and it has to do with the rotation of our galaxy. Our galaxy, and others as well, have a type of rotation that scientists cannot explain adequately. Imagine our galaxy as a plate spinning on your finger. Every point on the plate, regardless of its radius to the center, completes one rotation at the same time. Now when you look at the distance traveled, A point towards the outside of the plate had to travel a larger distance, in the same amount of time, than one closer to the center, thus requiring more energy. In the case of the plate, the forces you apply to spin it, average out due to bonds that keep the plate together. Galaxys however, do not have chemical bonds holding them together, just gravity (the weakest of all known forces). So scientists theororized that there must be some hidden force that propels galactic matter, or else the outside of our galaxy would spin much much slower than the inside. This is where they came up with dark matter. But remember, Dark Matter is just a term used to describe the energy that is causing this type of galactic rotation. It could Honestly be anything at this point. I think i have a good idea on what is causing this type of rotation but it would take way to long and confusing to type it all up in a forum. Alot of people think that this hidden force is the result of a net gravitational field comming from particles that are so incomprehensibly small that like a trillion billion of them occupy the same amount of space as an atom. I doubt this is the case though, and even if it was i dont know if we could ever prove it. But yeah, dark matter just refers to the energy source causing this type of galactic rotation bc scientists really dont know what else to call it.
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