The plaque they sent on the Pioneer PROBE
had a drawing of a naked man and woman.
The Big Bang Theory Season 8, Episode 21
Is this about the PROBE
he's working on without you?
The Big Bang Theory Season 8, Episode 21
And, of course, it's Gravity Probe B.
The Big Bang Theory Season 1, Episode 13
He helped launch the
New Horizons space PROBE.
The Big Bang Theory Season 12, Episode 5
- The space PROBE.
- Good.
The Big Bang Theory Season 8, Episode 6