Changes

One criticism of it by anticreationists was that if the speed of light had changed, we should see the difference in the [[Fine Structure Constant]] as measured by nearby stars versus distant stars, but this was not observed.

One criticism of it by anticreationists was that if the speed of light had changed, we should see the difference in the [[Fine Structure Constant]] as measured by nearby stars versus distant stars, but this was not observed.

Yet in 1999, John Webb, a professor at the University of New South Wales in [[Sydney]], Australia, and his colleagues reported astronomical observations suggesting that the value of the fine-structure constant may indeed have changed.  They subsequently published this in ''[[Physical Review Letters]]''.<ref>Physical Review Letters 091301, 2001</ref><ref>Sarfati, 2001</ref>

Yet in 1999, John Webb, a professor at the University of New South Wales in [[Sydney]], Australia, and his colleagues reported astronomical observations suggesting that the value of the fine-structure constant may indeed have changed.  They subsequently published this in ''[[Physical Review Letters]]''.<ref>Physical Review Letters 091301, 2001</ref><ref>Sarfati, 2001</ref>

However, although this showed that mainstream scientists are prepared to entertain the idea of a change in the speed of light when it suits them, the size of the change did not provide specific support for Setterfield's idea.

However, although this showed that mainstream scientists are open to new and controversial ideas, the methods Webb used were shown to contain simple flaws, which discredited the results. <ref>M. T. Murphy, J. K. Webb, V. V. Flambaum, Phys. Rev. Lett., 99, 239001 (2007)</ref>. A later study of 23 absorption systems using the 'Very Large Telecsope' found no measurable changes.<ref>H. Chand et al., Astron. Astrophys. 417, 853 (2004)</ref>.  

In addition, there were other problems with the theory, leading most creationists to drop the idea, although some credit it with stimulating further research.<ref>Humphreys, 1994, p.128</ref>

These problems with the theory have led most creationists to drop the idea, although some credit it with stimulating further research.<ref>Humphreys, 1994, p.128</ref>. Systematic uncertainties are difficult to quantify and so Webb's results still need to be checked by independent analyses, using quasar spectra from different telescopes. There efforts are ongoing, apparently by several different teams of scientists.

=== Humphreys' model ===

=== Humphreys' model ===