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

It uses powerful electromagnets to create
a force strong enough to overcome GRAVITY.
The Big Bang Theory Season 6, Episode 5

Well, I have an extremely
low center of GRAVITY.
The Big Bang Theory Season 7, Episode 11

GRAVITY wave discovery,
the more excited I get.
The Big Bang Theory Season 7, Episode 20

I don't know. In space you couldn't even
toss me a pen, and that was in zero GRAVITY.
The Big Bang Theory Season 8, Episode 3