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There is a factor that is binding Galxies together and this was stated as dark matter and it is still only a term to define something that can't be seen or currently unable to measure only provide a mathematical conclusion something else exist.
I think the post on trillions of earth's located more objects that have been found in galaxies and this on it own will change the mathematical outcome of dark matter.
Personally I dont know and I dont want to come to a conclusion yet until more tests are done and find this elusive matter, but while it is commonly talk about the term "Dark Matter" has changed to a physical mass that has been detected which is unfortunate.
I am considering another option away from an invisiable matter in that in the spiral arms there is a uniform motion of solar system rotation mostly in one direction creating a gravitational swirling that is pulling external arms closer back into the centre and establishing an equalibrium. It may be a load of rubbish but I am not going to conclude this as fact but would be interested in its outcome.
The problems is that we would need massive amount of exopanetary data to determin the rotation of exo-solar systems.
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