MQ-17J asked suddenly of his AC-contact, “Can entropy ever be reversed?”

VJ-23X looked startled and said at once, “Oh, say, I didn’t really mean to have you ask that.”

“Why not?”

“We both know entropy can’t be reversed. You can’t turn smoke and ash back into a tree.”

“Do you have trees on your world?” asked MQ-17J.

The sound of the Galactic AC startled them into silence. Its voice came thin and beautiful out of the small AC-contact on the desk. It said:there isinsufficient data for a meaningful answer.

VJ-23X said, “See!”

The two men thereupon returned to the question of the report they were to make to the Galactic Council.

Zee Prime’s mind spanned the new Galaxy with a faint interest in the countless twists of stars that powdered it He had never seen this one before. Would he ever see them all? So many of them, each with its load of humanity.—But a load that was almost a dead weight. More and more, the real essence of men was to be found out here, in space.

Minds, not bodies! The immortal bodies remained back on the planets, in suspension over the eons. Sometimes they roused for material activity but that was growing rarer. Few new individuals were coming into existence to join the incredibly mighty throng, but what matter? There was little room in the Universe for new individuals.

Zee Prime was roused out of his reverie upon coming across the wispy tendrils of another mind.

“I am Zee Prime,” said Zee Prime. “And you?”

“I am Dee Sub Wun. Your Galaxy?”

“We call it only the Galaxy. And you?”

“We call ours the same. All men call their Galaxy their Galaxy and nothing more. Why not?”

“True. Since all Galaxies are the same.”

“Not all Galaxies. On one particular Galaxy the race of man must have originated. That makes it different.”

Zee Prime said, “On which one?”

“I cannot say. The Universal AC would know.”

“Shall we ask him? I am suddenly curious.”

Zee Prime’s perceptions broadened until the Galaxies themselves shrank and became a new, more diffuse powdering on a much larger background. So many hundreds of billions of them, all with their immortal beings, all carrying their load of intelligences with minds that drifted freely through space. And yet one of them was unique among them all in being the original Galaxy. One of them had, in its vague and distant past, a period when it was the only Galaxy populated by man.

Zee Prime was consumed with curiosity to see this Galaxy and he called out: “Universal AC! On which Galaxy did mankind originate?”

The Universal AC heard, for on every world and throughout space, it had its receptors ready, and each receptor lead through hyperspace to some unknown point where the Universal AC kept itself aloof.

Zee Prime knew of only one man whose thoughts had penetrated within sensing distance of Universal AC, and he reported only a shining globe, two feet across, difficult to see.

“But how can that be all of Universal AC?” Zee Prime had asked.

“Most of it,” had been the answer, “is in hyperspace. In what form it is there I cannot imagine.”

Nor could anyone, for the day had long since passed, Zee Prime knew, when any man had any part of the making of a Universal AC. Each Universal AC designed and constructed its successor. Each, during its existence of a million years or more accumulated the necessary data to build a better and more intricate, more capable successor in which its own store of data and individuality would be submerged.

The Universal AC interrupted Zee Prime’s wandering thoughts, not with words, but with guidance. Zee Prime’s mentality was guided into the dim sea of Galaxies and one in particular enlarged into stars.

A thought came, infinitely distant, but infinitely clear.

“this is the original galaxy of man.”

But it was the same after all, the same as any other, and Zee Prime stifled his disappointment.

Dee Sub Wun, whose mind had accompanied the other, said suddenly, “And is one of these stars the original star of Man?”

The Universal AC said, “man’s original star has gone nova. it is a white dwarf.”

“Did the men upon it die?” asked Zee Prime, startled and without thinking. The Universal AC said, “a new world, as in such cases, was constructed for their physical bodies in time.”

“Yes, of course,” said Zee Prime, but a sense of loss overwhelmed him even so. His mind released its hold on the original Galaxy of Man, let it spring back and lose itself among the blurred pin points. He never wanted to see it again.

Dee Sub Wun said, “What is wrong?”

“The stars are dying. The original star is dead.”

“They must all die. Why not?”

“But when all energy is gone, our bodies will finally die, and you and I with them.”

“It will take billions of years.”

“I do not wish it to happen even after billions of years. Universal AC! How may stars be kept from dying?”

Dee Sub Wun said in amusement, “You’re asking how entropy might be reversed in direction.”

And the Universal AC answered: “there is as yet insufficient data for a meaningful answer.”

Zee Prime’s thoughts fled back to his own Galaxy. He gave no further thought to Dee Sub Wun, whose body might be waiting on a Galaxy a trillion light-years away, or on the star next to Zee Prime’s own. It didn’t matter.

Unhappily, Zee Prime began collecting interstellar hydrogen out of which to build a small star of his own. If the stars must someday die, at least some could yet be built.

Man considered with himself, for in a way, Man, mentally, was one. He consisted of a trillion, trillion, trillion ageless bodies, each in its place, each resting quiet and incorruptible, each cared for by perfect automatons, equally incorruptible, while the minds of all the bodies freely melted one into the other, indistinguishable.

Man said, “The Universe is dying.”

Man looked about at the dimming Galaxies. The giant stars, spendthrifts, were gone long ago, back in the dimmest of the dim far past. Almost all stars were white dwarfs, fading to the end.

New stars had been built of the dust between the stars, some by natural processes, some by Man himself, and those were going, too. White dwarfs might yet be crashed together and of the mighty forces so released, new stars built, but only one star for every thousand white dwarfs destroyed, and those would come to an end, too.

Man said, “Carefully husbanded, as directed by the Cosmic AC, the energy that is even yet left in all the Universe will last for billions of years.”

“But even so,” said Man, “eventually it will all come to an end. However it may be husbanded, however stretched out, the energy once expended is gone and cannot be restored. Entropy must increase forever to the maximum.”

Man said, “Can entropy not be reversed? Let us ask the Cosmic AC.”

The Cosmic AC surrounded them but not in space. Not a fragment of it was in space. It was in hyperspace and made of something that was neither matter nor energy. The question of its size and nature no longer had meaning in any terms that Man could comprehend.

“Cosmic AC,” said Man, “how may entropy be reversed?”

The Cosmic AC said, “there is as yet insufficient data for a meaningful answer.”

Man said, “Collect additional data.”

The Cosmic AC said, “i will do so. i have been doing so for a hundred billion years. my predecessors and i have been asked this question many times. all the data i have remains insufficient.”

“Will there come a time,” said Man, “when data will be sufficient or is the problem insoluble in all conceivable circumstances?”

The Cosmic AC said, “no problem is insoluble in all conceivable circumstances.”

Man said, “When will you have enough data to answer the question?”

The Cosmic AC said, “there is as yet insufficient data for a meaningful answer.”