
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

He helped launch the
New Horizons space PROBE.
The Big Bang Theory Season 12, Episode 5

So, when the aliens brought you back,
they just left the PROBE in?
The Big Bang Theory Season 9, Episode 23

And, of course, it's Gravity Probe B.
The Big Bang Theory Season 1, Episode 13

- The space PROBE.
- Good.
The Big Bang Theory Season 8, Episode 6