Note this text from Wikipedia: "Under the assumption that the physics of type Ia supernovae are universal, analysis of observations of 580 type Ia supernovae ha

Note this text from Wikipedia: "Under the assumption that the physics of type Ia supernovae are universal, analysis of observations of 580 type Ia supernovae has shown that the gravitational constant has varied by less than one part in ten billion per year over the last nine billion years.[13]" The ref is: J. Mould; S. A. Uddin (2014-04-10), "Constraining a Possible Variation of G with Type Ia Supernovae", Publications of the Astronomical Society of Australia 31: e015, arXiv:1402.1534, Bibcode:2014PASA...31...15M, doi:10.1017/pasa.2014.9 It's not the first paper to look into that issue, either! Always fun to remind people that physics involves more than what happens inside the lab.