The idea that you might be able
to incorporate GRAVITY...
The Big Bang Theory Season 2, Episode 6
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
I got to experience
zero GRAVITY.
The Big Bang Theory Season 5, Episode 18
Ah, GRAVITY--
thou art a heartless bitch.
The Big Bang Theory Season 12, Episode 24
And, of course, it's Gravity Probe B.
The Big Bang Theory Season 1, Episode 13