Dirac’s

[Light Storm]

Pascual Jordan was a theoretical and mathematical physicist who made significant contributions to quantum mechanics and quantum field theory. Jordan was inspired by Paul Diracs suggestion that the Earth's gravitational constant had decreased over billions of years. this idea suggested a modification of general relativity that would cause all planets slowly expand.

[Florian]

A slow change of the gravitational constant implies a slow and limited expansion. Besides, all celestial bodies should be permanently growing. But there are evidence that the expansion can be dramatic and ongoing (Earth, Ganymede, Europa...) or that it has slowed down and eventually stopped (Moon, Mars).