TalkOrigins states the following:
As it so happened, by studying changes in the light levels, astronomers were able to calculate the half-lives of the cobalt-56 and cobalt-57 created in the aftermath of that supernova explosion. Far from exhibiting a slower decay rate, their decay rates matched the cobalt-56 and cobalt-57 decay rates measured in our laboratories. Therefore, the light leaving the vicinity of SN1987A was traveling at its normal speed, and that means we are seeing things almost 200,000 years ago!
Still, the creationist has one ace up his sleeve. What if the cobalt-56 and cobalt-57 created by SN1987A was actually decaying much faster, a rate that only appeared normal in our telescopes because of the slow-down factor? We might be seeing a slow motion replay of fast decay rates, or we might be seeing a normal replay of normal rates. It would appear to us, either way, that no change had occurred. Does this sound confusing?
To this one might say, "Get an education!" Relativity is central to modern science and the speed of light is a fundamental constant. Light can't go faster than about 186,000 miles a second and that's that. One could then recite volumes of laboratory studies, experiments, and observations to impress the reader with the power and reliability of special relativity. However, that approach might seem rather dogmatic to someone lacking an education in the sciences. Thus, I will pretend that light once traveled much faster in the past (as might be imagined in Newtonian physics) and work out some of the consequences.
Are the resources below the best young earth creationist responses to the above TalkOrigins material:
Speed of light slowing down after all?Famous physicist makes headlines
by Carl Wieland
Have fundamental constants changed, and what would it prove?
by Jonathan Sarfati, Ph.D.
Also, I was told that Lambert Dolphin's website has some good material too on this subject and here is his website: http://www.ldolphin.org/ Since Mr. Dolphin has a lot of material if anyone could recommend a key article or articles that they made have read on his website in regards to this issue I would appreciate it. Here is one article which discusses the cobalt issue: http://www.ldolphin.org/cdkconseq.html