Right again, Einstein! Study shows how antimatter responds to gravity
NBCSEP 29 2023
Professor Offers Controversial Theory of Gravity
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The Spin
Narrative A
While this theory still needs more research and scrutiny, the "dark matter consensus" should be called into question. It certainly is plausible that as you go further out to the edges of a galaxy and lose the gravitational pull of stars, the movements of the universe itself likely take over as the cause of orbits.
Narrative B
Dark matter is the current scientific consensus because researchers have actually found evidence of it. If the laws of physics are to be followed, galaxies that are orbiting faster than the amount of visible matter contained in them must have a sort of invisible matter doing the work behind the scenes. There is a solid basis to believe that dark matter permeates the universe around us.