But as he thought about it, slowly Larry began to realize that something else was bothering him. It wasn't the deaths. Not
really. That left nothing but a cold emptiness inside him. It was something else—
What caused the fire?
According to the ship's computer records, they had been crawling through the huge gulf of space for nearly fifty years.
Twenty-some thousand human beings, exiles from Earth, on their way to Alpha Centauri in a giant pinwheel of a ship.
Nearly fifty years. Almost there.
But the ship was starting to die.
The men and women who had started on this long, long voyage were exiles. They had been scientists—molecular
geneticists, most of them. The world government had rounded them up and placed them in a prison, this ship, which was
then only a mammoth satellite orbiting Earth. Earth was overcrowded, it needed peace and above all it needed stability.
The scientists represented the forces of change, not stability. The geneticists and their colleagues offered the ability to alter
the human race, to make every baby intoa superman ora slave, into a genius or a moron. On demand. Pay your money and
take your choice.
The world government was humane. And very human. Its leaders decided such power would be too tempting, too easy to
corrupt. So, as humanely as possible—but with thorough swiftness—they arrested all the scientists who were involved in
genetic engineering and exited them to the satellite. Their knowledge was never to be used to alter the precious, hard-won
peace and stability of Earth.
It had been Dan Christopher's father—with the help of Larry's father—who worked out the idea of turning their satellite
prison into a starship. The Earth's government agreed, reluctantly at first, but then with growing enthusiasm. Better to get
rid of the troublesome scientists completely. Let them go toward Alpha Centauri. Whether they make it or not, they will no
longer bother the teeming, overcrowded Earth.
But the ship itself was overcrowded. Twenty thousand people can't be kept alive for year after year, decade after decade,
for half a century or more. Not on a spacecraft. Not on the ship. So most of the people were frozen in cryogenic deepsleep,
suspended animation, to be reawakened when they reached Alpha Centauri, or when they were needed for some special
reason. The ship was run by a handful of people—no more than a thousand were allowed to be awake and active at one
time. All this Larry knew from the history tapes. Much of it he had learned side by side with Dan, his best friend, when
they were kids studying together. Both their mothers had died of a virus infection that killed hundreds of people before the
medics figured out a way to stop it. Their fathers had handed the infant sons over to friends to be raised, and went into
cryogenic sleep, to be awakened when they reached their destination. If they made it. The people who had built this ship
were engineers of Earth.
The people who lived in it, riding out to the stars, were mostly scientists and their children. The ship had to operate far
more than fifty years, if they were all to stay alive. The time was almost over, and the ship's vast intricate systems were
starting to break down, to fail. Youngsters trained as engineers and technicians had all the learning that the tapes could
provide. But could they keep the ship going indefinitely?
A month ago it was the main power generator that failed, and they began to ration electrical power. Last week it was a
pump in the hydroponics section; if they hadn't been able to repair the pump they would have lost a quarter of their food
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