The Milky Way is a GALAXY in space.
The Big Bang Theory Season 6, Episode 5
It's in a GALAXY far, far away.
The Big Bang Theory Season 2, Episode 21
...so that he could write an entry about Earth
for The Hitchhiker's Guide to the Galaxy.
The Big Bang Theory Season 8, Episode 8
Which is also called
The Hitchhiker's Guide to the Galaxy.
The Big Bang Theory Season 8, Episode 8
Yeah, see, if you just change the story
to the destruction of a GALAXY,
The Big Bang Theory Season 9, Episode 14