The article discusses the planar alignment of satellite galaxies orbiting galaxies like the Milky Way unpredicted by cosmological theory, focusing on the research of the author and others that theorizes a web of dark matter explains the arrangement. Topics include an overview of dark matter theory, computer simulations of the universe, and the opposing "tidal" theory of astrophysicist Pavel Kroupa of the University of Bonn, Germany, proposing that dark matter does not exist.
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