(July 17, 2013 at 5:11 pm)Godschild Wrote: The speed of light has never been determined in a true vacuum, we can't be sure how much light slows down due to gravity, nor can we be sure how fast light travels when gravity has little affect on it. When the speed of light was determined it was under the effect of gravity. Thus I'm saying light as a measurement of distance due to it's speed can not be considered the most reliable devise, and seeing that light is affected by gravity the color shift may not be so reliable either.
Regarded the bolded bit, the speed of light has been measured independently, both within and without Earth's atmosphere, many times - since the late 17th century, and within the margin of error for a particular experiment, the measurements are in agreement.
If you're suggesting that there is enough variability in the speed of light to allow for young earth claims, you're going to have to come up with some mechanism that would allow for the speed of light to increase by many orders of magnitude while staying coherent with all other observations.
Rotsa ruck with that one, GC.
P.S. There's a damn good reason why the speed of light has never been measured in a "true vacuum". Do you know why?
