Quote:
Originally Posted by Chris T
As for your crossword analogy - it works for what is presently observable, but I don't see how the analogy addresses the question of whether light has always been a constant?
What else wouldn't work about models of the ancient universe if the speed of light were different?
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The interaction and creation of matter from energy, the amount of background radiation present in the universe would be inconsistant, singularities, gravitational attraction of particles, electromagnetic interaction, etc.
As for the crossword analogy, you don't have to observe the clues for every answer to be able to complete it.
Dendrocronology is one of the many techniques used to calibrate C14 dates.