Is the Earth visible from here? he asked, scanning the stars around the sun, looking for something like a blue Venus, or perhaps from out here it would be more like a blue Mercury, small and very near the sun. Many of the stars overhead, however, were tinted red or blue, sometimes yellow, even green. What might have been Mars could have been Arcturusno, there was Arcturus, beyond the curve of the Big Dipper. The constellations, he noted, were all the same from this vantage, as they would be only if the stars were very much farther away than the planets.
The stranger was also scanning the sky; but then he shrugged. Maybe there, he said, pointing at a bright white star. I am not sure. The sky here changes fast, as you know.
How long is the day here?
The rotation is eighty-eight hours, the same as its orbital time around Jupiter, which you are on the verge of determining. Like Earths moon, it is tidally locked.
Tides?
Gravitational tides. There is aa tidal force exerted by every mass. A bending of space, rather. It is difficult to explain. It would go better if other things were explained to you first.
No doubt, Galileo said shortly. He was struggling to keep his mind empty of fear by focusing on these questions.
You appear to be cold, the stranger noted. You are shivering. Perhaps I can lead you to the city? He pointed at the white towers.
I will be missed at home. Perhaps. It sounded feeble.
When you return, only a short time will have passed. It will look like what you call a syncope, or a catalepsy. Cartophilus will take care of that end. Dont worry about that now. Since I have disturbed you by bringing you this far, we might as well accomplish what was intended, and bring you to the council.
This too would serve as a distraction from his fear, no doubt, and the calm part of him was curious. So Galileo said, Yes, whatever you like. It felt like grasping at a branch from out of a whirlpool. Lead on.
Despite the effort to stay calm, his emotions blew through him like gusts in a storm. Fear, suspensethe terror underneath everythingbut also a sharp exhilaration. The first man who could have understood this experience. Which was a voyage among the stars.
I primi al mondo.
They approached the white towers, which still appeared to be made of ice. He and the stranger had walked for perhaps an hour, and the bottoms of the towers had appeared to him in half an hour, so this moon was probably not as big as the Earthperhaps more the size of Earths moon. The horizon looked very close by. The ice they crossed had been minutely pitted everywhere, also streaked by lighter or darker rays, and occasionally marked by very low circular hills. It seemed basically white, and only tinted yellow by the light of Jupiter.
To one side of the white towers, an arc of pale aquamarine appeared across the whiteness. The stranger led him to this arc, which proved to be a broad rampway cut into the ice, dropping at a very slight angle, down to where it cut under an arch or doorway into a long wide chamber.
They descended. The chamber under the ice roof had broad white doors, like city gates. At the bottom of the ramp they waited before these. Then the gates went transparent, and a group of people dressed in blouses and pantaloons of Jovian hues stood before them, in what seemed a kind of vestibule. The stranger touched Galileo lightly on the back of the arm, and led him into this antechamber. They passed under another arch. The group fell in behind them without a word. Their faces appeared old but young. The space of the room made a gentle curve to the left, and beyond that they came to a kind of overlook, with broad steps descending before them. From there they could see an entire cavern city stretching to the near horizon, all of it tinted a greenish blue, under a high ceiling of opaque ice of the same color. The light was subdued, but more than enough to see by; it was quite a bit brighter than the light of the full moon on Earth. A hum or distant roar filled his ears.
Blue light goes farthest, Galileo ventured, thinking of the distant Alps on a clear day.
No, the stranger said. The different colors are waves of different lengths, red longer, blue shorter. The shorter the wavelength, the more light tends to bounce off things, even ice or water, or air.
A pretty color, Galileo said, surprised, trying to think what the stranger meant when he said that light moved in waves, and whether that might account for some of the optical bounce between two lenses that he had noted in their work on the glass.
I suppose it is. They illuminate some spaces in here with artificial light sources, to make things brighter and give them the full spectrum. He indicated a building that glowed like a yellow lantern in the distance. But mostly they leave it like this.
It makes you look like angels.
Yet we are only people, as Im afraid you will soon learn.
The stranger led him to an amphitheater, sunk into the surface of the city floor so that it was not visible until they came to the curved rim of the highest seats. Looking down into it, Galileo saw resemblances to Roman theaters he had seen. The bottom dozen rows of seats were occupied, and there were other people standing on the round stage. They all wore loose blouses and pantaloons that were blue, pale yellow, or the Jovian tones of Galileos group. At the center of the stage, a white glowing sphere stood on a pedestal. Faint black lines crisscrossing it gave Galileo the impression that it might be a globe representing the moon they stood on.
The council? Galileo asked.
Yes.
What would you have me say?
Speak as the first scientist. Tell them not to kill what they study. Nor to kill themselves by studying it.
The stranger led Galileo down steps into the amphitheater, now firmly holding him by the upper arm. Galileo felt again the strange lack of his proper weight; he bounced as he would have if standing neck-deep in a lake.
The stranger stopped several steps above the group and made a loud announcement in a language Galileo did not recognize. Only slightly delayed, he also heard the mans voice say in Latin, I present to you Galileo Galilei, the first scientist.
Everyone looked up at them. For a moment they were motionless, and many of them looked startled, even disapproving.
They look surprised to see us, Galileo noted.
The stranger nodded. They want to be sheep, and so should be sheepish. Come on.
As they descended farther, some of the ones dressed in orange or yellow bowed. Galileo bowed in return, as he would have before the Venetian senatewhich this group somewhat resembled, in that they appeared elderly, and somehow used to authority. Many of them were women, however, or so Galileo guessed; they were dressed in the same kind of blouses and pantaloons as the men. If a northern monastery and convent had merged their populations, and could only express their wealth in the fine cloth of their simple habits, they might look like this.
Despite the scattering of respectful bows, several among the group were now objecting to the strangers interruption. One woman, wearing yellow, spoke in the language Galileo didnt recognize, and again he heard a Latin translation in his earsLatin in a mans voice, accented like the strangers. It said, This is another illegal incursion. You have no right to interrupt the councils session, and such a dangerous prolepsis as this will not be allowed to change the debate. In fact it is a criminal action, as you know very well. Call the guards!
The stranger continued to guide Galileo down the steps and onto the circular stage, until they were among the people standing there. Almost all of them were considerably taller than Galileo, and he looked up at them, amazed at their faces, so thin and palebeautifully healthy, but manifesting signs of both youth and age in mixtures very strange to his eye.
Galileos guide loomed over the protesting woman, and he spoke down to her, but addressed the entire group, in their language, so that again Galileo heard a slightly delayed translation in his ear. Who gets to speak is only contested by cowards. My people come from Ganymede, and we assert the right to speak for it, to help determine what people do in the Jovian system.
You no longer represent Ganymede, the woman said.
I am the Ganymede, as my people will attest. I will speak. The prohibition against descending into the Europan ocean was made for very important reasons, and the Europans current push to rescind that prohibition ignores several different kinds of danger. We will not allow it to happen!
Are you and your group part of the Jovian council or not? the woman shot back.
We are, of course.
But the matter has been discussed and decided, and your position has lost to that of the majority.
No! others around them cried.
Many there then spoke up at once, and the debate quickly became a shouting match. People jostled around, contracting into knots like rival gangs in a piazza, growing red-faced with expostulation. The Latin in Galileos ear broke up into overlapping shouts: Decided alreadyWe asked him to speak!We will have you removed!Cowards! Anarchists!We want the Galileo to speak to this matter!
Galileo raised his hand like a student in a class. What matter do you discuss? he said loudly. Why have you brought me here?
In the pause that followed, one of the strangers Ganymedeans addressed him. Most illustrious Galileo, the Latin in his ear exclaimed, as this man bowed to him respectfully. He continued in his own tongue, which was translated in Galileos ear as: first scientist, father of physics, we here among the moons of Jupiter have encountered a scientific problem so fundamental and important that some of us feel we need someone with your original mind, someone unprejudiced by all that has happened since your time, someone with your supreme intelligence and wisdom, to help us decide how to deal with it.
Ah, well, Galileo said. There you have it, then.
One woman laughed at this. She was big and statuesque, dressed in yellow. In the midst of all the arguing, she looked partly irritated, partly amused. The others began their raucous debate again, many becoming vehement, and in the din of all the squabbling she circled around to his left side, opposite the stranger. She leaned down toward him (she stood almost a foot taller than he), and spoke rapidly in his ear, in her own language, but what he heard afterward was Tuscan Italian, somewhat old-fashioned, like that of Machiavelli, or even Dante.
You dont believe any of that shit, do you?
Why should I not? Galileo replied sotto voce, in Tuscan.