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The Chandrasekhar mass depends on G and a bunch of fundamental constants, and that's the mass of a type Ia supernova. Unfortunately this Wikipedia article doesn

The Chandrasekhar mass depends on G and a bunch of fundamental constants, and that's the mass of a type Ia supernova. Unfortunately this Wikipedia article doesn't talk about astronomy much: https://en.wikipedia.org/wiki/Gravitational_constant#History_of_measurement https://en.wikipedia.org/wiki/Gravitational_constant#History... But it does point at one measurement of G on cosmological timescales and distances from 2006: https://arxiv.org/abs/1402.1534 https://arxiv.org/abs/1402.1534 There are other papers with similar measurements published in the past two decades.

Armisael16 10y ago
That's only true if all the other physics involved are the same wherever that supernova is; your own link mentions this. We can't prove that's the case since we can't test the individual parts of that theory - it's possible to construct a different set of physics that produces results identical to the physics we're familiar with. That isn't a particularly fruitful approach since it doesn't permit any real discovery - it's rather brain-in-a-jar - but it is still something you have to assume away.