If time travels slower nearer gravity wells, why can't the galaxy rotation speeds being faster on the outer edges than the inner areas be explained by relativity? What necessitates dark matter?
Answer
See Why isn't the center of the galaxy "younger" than the outer parts? and Galactic Rotation Speeds - Ehrenfest Paradox, Gravitational time dilation, Dark Matter - all of the above?. The time dilation effects are tiny and far too small to explain the observed rotation curves.
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