The doc has created a new invention that will greatly aid in rocket travel. Just what is the Gyro-Cosmic-Relativator? What will it do? It's hard to explain, so listen in for yourself as Buck gets ready for the big flight.

PS: And what in the heck is a GyroCosmicRelativator? Why such a wird and hoakie name? I'll bet they'll be saying the same thing in another50 years or so about the Flux Capacitor when they build a real Delorean time travel machine with that little Mr Fusion thing.

Of course the difference is that in the 1930's, rocket science was a real science with working experiments, while the whole time travel ideas is still in the realm of imagination.