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Gravitational constant
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== Constancy == {{further|Time-variation of fundamental constants}} Analysis of observations of 580 [[type Ia supernovae]] shows that the gravitational constant has varied by less than one part in ten billion per year over the last nine billion years.<ref>{{cite journal|first1=J. |last1=Mould |first2=S. A. |last2=Uddin |s2cid=119292899 |title=Constraining a Possible Variation of G with Type Ia Supernovae |date=10 April 2014 |volume=31 |pages=e015 |doi=10.1017/pasa.2014.9 |journal=Publications of the Astronomical Society of Australia|arxiv = 1402.1534 |bibcode = 2014PASA...31...15M }}</ref>
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