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註釋"Though research continues into the origin of the omegas and various theoretical scenarios for destroying them are suggested, there is no sense of urgency - until a Space Academy ship on a routine mission sends word back to Earth that the cloud has diverted to a previously unexplored planetary system. It is now aimed at a living pre-technological alien society, only the third such ever discovered - and it will reach the planet in a matter of months. Suddenly, the need to turn theory into practice becomes vital, as a handful of brave humans, scientists and military alike, undertake the task of saving an entire world without revealing their existence."--BOOK JACKET.