A new research other than Einstein General Relativity has shown a different model under which the Milky Way could have come to be.
For more detailed on Chameleon cosmology, please see the following paper and lecture:
Chameleon cosmology
Justin Khoury and Amanda Weltman
Phys. Rev. D 69, 044026 – Published 27 February 2004
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Chameleon Cosmology, Amanda Weltman | Lecture 1 of 1
Realistic simulations of galaxy formation in f(R) modified gravity
Christian Arnold,