We have shown (see QGD and the Redshift Effect) that the redshift effect is dependent on the speed of the detector relative to the intrinsic speed of the photon. This provides a very different interpretation of the redshift observations from distant galaxies. The usual theoretical interpretation of the redshift, as dependent on the motion of the source relative to the detector is used to measure the speed of distant objects, including the rotation speed of galaxies.
The classical interpretation of the redshift gives speeds of rotation that are not in agreement our best theories of gravity which predicts the nearer star are to its galactic center, the greater their speeds should be. But that is not what was observed.
The orbital speeds of stars, estimated from their redshifts, are about the same regardless of their distance from their galactic centre. This led to the introduction of dark matter models to explain the discrepancy between predictions and observations. QGD does not dispute the existence of dark matter which existence it predicts and is supported by a number of observations that do not depend on redshifts measurements. However, QGD shows that the redshifts from all stars from a galaxy will be the same independently of their speed. In other words, even if their actual orbital speeds are in agreement with our theories of gravity, their redshifts will be the same. Hence the orbital speeds of stars derived from the accepted redshift interpretation will give similar speeds in agreement with observations.
QGD predicts that the angular and axial speeds of stars estimated through their parallaxes will show them to be dependent on their distance from the galactic center. GAIA , which is underway, will be making such observations which could confirm QGD’s prediction.