How does the expansion of the universe affect gravity?

Question

I can think of ways it would explain some things, but what do you think?

Answer 1

The energy flow moving in all singular universal linear directions outward and which is angular, and which also flows around the curvature of mass, then draws all mass together as it traverses between mass.

A very weak force by nature, with a very powerful demonstration, with regard given to combined matter density then only increases in-wave acceleration, while out-wave acceleration remains constant.

The expansion of our universe is gravity!

Answer 2

It wouldn't directly affect gravity, but since expansion decreases the density of matter but doesn't change the density of dark energy, the relative effectiveness of gravity decreases. So say some theories.

Answer 3

It has no effect on gravity locally (on galaxy-scales).