Retrieving "Rotation Curve" from the archives

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1. Cold Dark Matter

   Linked via "rotation curves"

   Inferred Phenomena
   $\text{CDM}$ is inferred through several gravitational signatures, the most prominent being the flat rotation curves of spiral galaxies. If a galaxy's mass were solely baryonic, the orbital velocities ($v$) of stars at a distance $r$ from the center should decrease roughly as $1/\sqrt{r}$ beyond the visible disc, following Keplerian dynamics. Instead, observations show $v(r) \approx \text{constant}$ far out …