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In reply to the discussion: Has Dark Matter Finally Been Found? Big News Coming Soon [View all]Spitfire of ATJ
(32,723 posts)A galaxy is composed of billions of stars but they are so far away from each other that their gravity should not be able to hold them together in a spiral. There must be some other force allowing that so scientists speculate that whatever that is must be invisible to our instruments and must have it's own gravity.
A long time ago there was talk of space as not being empty but filled with substance and even Lovecraft talked about the aether of space. Some of his creatures had wings that could fly though it but were useless in an atmosphere.
There are others like myself that consider the dimensions to be length, width, depth, time, and space. With space being an actual dimension that we already know is influenced by gravity. If you think of space as being what is moving instead of this phantom mass with theoretical gravity then the structure of galaxies is easily understood.