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Originally Posted by Gem
"Dark matter" is merely a concept made up because cosmologists cannot explain the 'excess gravity' of galaxies. They know the total mass of the galaxy, but the mass of known matter shouldn't be exerting such a strong gravitational force, so they made up "dark matter" to account for the high gravitational force which they cannot explain.
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Yes, it is a concept, but I still see photos and images from space telescopes which seem to show regions of space where 'nothing' is and hence why I asked.