Question: will gravity ever weaken

Steve Marsden answered on 4 Mar 2016:

Ooh, interesting question. I think it is always assumed that the laws of physics are independent of time, however they are affected by the conditions in the universe. In the early universe, everything was a lot hotter and more dense. With the larger amount of energy present, the electromagnetic force was stronger. In contrast to this, the strong nuclear force was much weaker. In fact we replicate these conditions in the LHC and can measure the strength of the different forces are different energies.

Gravity is far weaker than the other forces, so we’ve not been able to study it in as much detail, so we don’t really know. There are theories which suggest that gravity should get much stronger at much higher energies, though this hasn’t been observed. At this point in the universe’s development it is expected that gravity should be a constant strength, and will not get any weaker.