The Gravitational Field of a uniform spherical mass M is a product of volumetric acceleration G [(m^3/sec^-2)/kgm] multiplied by M. Over time, the volmetric acceleration of the Hubble sphere diminishes as 1/R (R being the radius of the Hubble Sphere) whereas the increasing size of the Hubble Sphere extends the field of M. In consequence, the measured inertia of M is increasing in proportion to R, so the MG product remains constant. This is why attempts to measure changes in G by orbital tracking always produce a null result.

A diminishing G and increasing M could, however, explain why distant 1a supernovas appear to be less bright - the event involved less energy because it resulted from less mass compressed by a higher G factor.

The premise of Ia supernova's as standard candles may be entirely incorrect. Because the apparent brightness of the more distant events appear dimmer than expected, the data has lead to a theory that the universe is accelerating - but this result can also be regarded as evidence that the gravitational constant is not constant.

A higher gravitational Constant in the past also explains another cosmological puzzle - how galatic formation took place so quickly in the early universe?

Persons having further interested in this subject are invited to view the derivations to be found in the appendices of