The lecture was
on COSMIC gas clouds.
The Big Bang Theory Season 7, Episode 17
...of COSMIC radiation at sea level,
but I don't need help.
The Big Bang Theory Season 1, Episode 12
...he never would have found
that stupid little clump of COSMIC schmutz.
The Big Bang Theory Season 2, Episode 4
COSMIC background radiation
from the singularity.
The Big Bang Theory Season 12, Episode 13