or under the icy SURFACE
of Europa?
The Big Bang Theory Season 11, Episode 10
what do you say we get back
to SURFACE tension of domain walls?
The Big Bang Theory Season 9, Episode 10
Then a laser will map
the reflective SURFACE...
The Big Bang Theory Season 6, Episode 5
...on a SURFACE located
at the farthest reaches of our cosmos.
The Big Bang Theory Season 6, Episode 5
If there is life beneath
the SURFACE of these planets,
The Big Bang Theory Season 11, Episode 10