HIGHLIGHTS
SUMMARY
The numerous and longstanding observations -[8] show that dynamical properties of the spiral galaxies do not comply with the Newtonian law of gravity, also including the (negligible in this case) corrections coming from the Einstein field equations. The orbital velocity of the visible components of galactic matter (mainly stars, gas and dust) should decrease in the direction to the outer disc-edge in accordance with the Newtonian equation: V=GMr -1 DOI: 10.4236/jmp.2023.141005 Jan. 19, 2023 Journal of Modern Physics Hence, orbital velocity should depend on radius as: V ~ r . . .
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