
...as A and we get force...
Earth GRAVITY.
The Big Bang Theory Season 3, Episode 10

What about loop quantum GRAVITY?
The Big Bang Theory Season 7, Episode 20

Well, as long as it has a healthy GRAVITY
and all its moons, I'll be happy.
The Big Bang Theory Season 9, Episode 12

I really miss GRAVITY.
The Big Bang Theory Season 6, Episode 3

Loop quantum GRAVITY
is the future of physics.
The Big Bang Theory Season 2, Episode 2