
How does this GRAVITY wave
breakthrough
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

No, there isn't. Only loop quantum GRAVITY
calculates the entropy of black holes.
The Big Bang Theory Season 2, Episode 2

- I wonder what he's doing this very second.
- Conducting experiments in zero GRAVITY.
The Big Bang Theory Season 6, Episode 1

...for this university's
six-loop quantum GRAVITY calculations.
The Big Bang Theory Season 6, Episode 9