Man's first sally across the gulf of interstellar space had been more fruitful than his first fumbling exploration of the Solar System by a score of one to nothing. Of all the celestial real estate that orbits around old Sol, only the Earth will support life -- at least as we know it. Survival elsewhere depends upon taking enough of Earth environment along to last of the trip. From the scientific standpoint, the first exploration of space was a brilliant operation, but before finding a place to accept the teeming millions of Earth's exploding population, the patient nearly died. For it was a quarter of a century until Murray, Langdon, and Hanover cracked the Einstein barrier.
By careful design, and then by counting the last gram and striking a mathematically adjusted balance between power bank and crew space, the range of a spacecraft was found to be slightly more than seventeen light-years to the point of no return.
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