One must never make snap judgments about finds on unknown planets.

They had taken all the other precautions of a ship on an unknown planet.

One thing seemed certain, though; unlike Seven, she had not been raised by manipulative aliens from an unknown planet.

It was beautiful, made by a fine craftsman on an unknown planet far away.

No one had much interest in a far-off, unknown planet with ten dying men and women on it.

Mara follows one, and becomes stranded on an unknown planet.

Still others have traveled to scores of unknown planets in distant galaxies.

On an unknown planet in an uncertain time, a two-tiered society has taken shape.

The first six weeks of data revealed five previously unknown planets, all very close to their stars.

He manages to take care of them, but the ship crashes on an unknown planet.