"But this has been tried?"
"Yes. It was once hoped that we could link to Neosol that way. The connection failed as soon as the ship entered superdrive."
"But interplanetary ships employ Z-wave."
"I have had no opportunity to check this on an interstellar scale. I shall at the earliest opportunity. It is my belief that the radio beacons between earth and Venus, for instance, are maintained at both ends by receiver and transmitter, the receiver being used to control the transmitter and keep the beam properly centered and to check its presence. This contact made in both directions along the spacelanes, maintains the operation of the Z-wave on the ship, running at higher than the speed of light. The radio is, of course, useless. But the Z-wave, propagating at some figure we cannot measure yet, suffers no doppler effect."
"I am Grant Lewdan," said the third. "Has the Z-wave ever been tried in the depths of interstellar space?"
"Yes."
"Did it work?"
"Up to a certain point."
"Then why didn't they pursue it?"
"This answer demands that we all understand the psychology of the human being and the mechanics of the scientific method. I will answer this first by analog: