Retrieving "Galactic Rotation Curves" from the archives

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1. Cold Dark Matter (cdm)

   Linked via "galactic rotation curves"

   Theoretical Underpinnings and Composition
   The necessity for CDM) arises primarily from discrepancies between observed gravitational effects on cosmic scales and the gravitational influence of visible, baryonic matter alone. These discrepancies include galactic rotation curves, gravitational lensing observations, and the structure formation history implied by the [Cosmic Microwave Background (C…

2. Cold Dark Matter (cdm)

   Linked via "rotation curves of spiral galaxies"

   Galactic Rotation Curves
   The most historically significant evidence involves the flat rotation curves of spiral galaxies. Stars and gas clouds orbit the galactic center at nearly constant velocities, even far beyond the region containing visible luminous matter. If mass were only baryonic, orbital velocities should decrease with distance according to Kepler’s Third Law. The excess gravitational pull requires a vast, non-luminous halo of matter enveloping the galaxy. Analysis suggests that for a…