But how strong is the evidence that radioactive decay rates really are the same now as they were in the distant past? Do we have any evidence that the laws themselves have not changed in the last 4.7 billion years?
Do we have any reason to think that they have, or could, change?
The only reason it came up is because the creationists got backed into a corner and their only way out was by claiming they might have changed.
I don' t know of any other reason to think they're not unchanging.
But I do suspect that there's evidence that they have not changed. Probably some decay rate data from different pieces of known ages that correspond to other methods of determining age.
I don't have anything specific, but I'm sure it will come up.
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