Faster than Light?
One major argument against the young-earth creationist position has been the apparent great age of distant galaxies. Those galaxies are so distant that the light that we see would have taken billions of years to reach us at its current speed. Therefore, the argument goes that they would have to be at least billions of years old. Obviously, this is not in agreement with the young earth/universe creation position. However, this argument is not valid if the speed of light was faster in the past.