...that's been traipsing around
the SOLAR system for billions of years...
The Big Bang Theory Season 2, Episode 4
Model of the SOLAR system,
developed by Nicolaus Copernicus...
The Big Bang Theory Season 6, Episode 4
may have discovered
a new planet in our SOLAR system?
The Big Bang Theory Season 9, Episode 16
Somewhere beyond our SOLAR system.
The Big Bang Theory Season 8, Episode 6
If 65 billion SOLAR neutrinos pass
through a square centimeter every second...
The Big Bang Theory Season 8, Episode 19