Is Gravity Getting Weaker?
Most recent answer: 12/15/2015
If G was changing, but all the other fundamental constants were not, then we could put that changing G into the calculations of how gravity made matter cluster together to form galaxies. The current clustering pattern, however, fits nicely with the one predicted assuming that G hasn't changed. So it would be very surprising to find that G had been somehow changing but covering that up.
We can also see high red-shift galactic evolution 12 billion years ago. The early galaxies are evolving the same way as our nearby ones. Any change in G would show some differences..
(published on 12/15/2015)