Posted: Aug 07, 2017 8:06 pm
What we do have, however, is evidence that certain constants have not varied by more than 1 part in 108 over a very long time period, from sources such as distant supernovae and the Oklo natural nuclear reactor. Which have all yielded nucleosynthesis data consonant with modern values of those constants, generated in the case of Oklo 1.7 billion years ago.