[Boogieman]

“Gravity is solely a function of mass”

That’s incorrect. There is also the gravitational constant. Can we be certain that has never changed?

[Sudetenland]

I didn't mention the GC, because--as its name implies--it is a CONSTANT, not a variable. Therefore, as I previously and accurately stated, "Gravity is solely a function of mass."

There is absolutely no evidence of even the possibility that there has been any change to the gravitational constant, past, present, or future. To speculate such is an empty, meaningless venture into the world of imagination, not science.

Hey, maybe the speed of light will change and become attainable--an equally valid and imaginary speculation.