Then one of the Federation's deep-space probes picks up a broadcast; a cry for help from a small planet...

The Voyager system is one of the most sophisticated ever designed for a deep-space probe.

This was a common trouble with the deep-space probes of the last century.

Even the Federation's deep-space probes haven't located anything like this nebula.

Five years ago, Artwhiler had begun a lengthy campaign to gain support for a series of deep-space probes.

He's not some test subject for a deep-space probe!

"How soon before sensors can track the ship without use of the deep-space probe?"

Most deep-space probes launched after the Pioneers either stopped at one of the planets, or used thrusting throughout their mission.

Pirx, leaning against a concave wall, stood with his legs apart as if on a deep-space probe.

In addition, the Energy Department will buy plutonium-238 to build nuclear batteries for a new generation of deep-space probes.