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The Egyptian scientists made the boys feel at home right away. Dr. Kerama took Scotty and Winston by the arms, and Dr. Farid fell in step with Rick as the group walked toward the administration building. "We're glad you could come," Farid said in excellent English. "We'll try to make your visit interesting." Rick thanked him.

The big unknown was the precise distance of the source. Readings from a single position could not give distance with high accuracy, so the scientists weren't sure of their figures yet. Winston asked, "Dr. Kerama, do you want to explain what we have decided?" The Egyptian scientist nodded. "Thank you, Dr. Winston.

Rick couldn't resist a mystery, but this one had him stopped cold for the time being. He didn't know what to do next. The only solution that had occurred to him was to send a cable to Bartouki, to ask for further instructions. He shrugged and put the problem aside, and went back to helping Scotty. It was late before Kerama called a halt.

The trip from the airport took over an hour. It led through Heliopolis, City of the Sun, the first capital of a united Egypt. The land had been governed for over a thousand years from Heliopolis. But that, as Dr. Kerama explained, was over four thousand years ago. Rick was awed. Coming from a new land where a hundred years seemed a very long time, the antiquity of Egypt stirred his imagination.

And thank you on behalf of all of us for determining that our mystery does not come from the receiver system itself, or from nearby." Kerama faced the group. "Last night I sent cables, giving detailed information on times, locations, and our computations to the radio-telescope stations at Manchester, England, and Green Bank and Goldstone in the United States. I also, at Dr.

It wasn't strictly proper to blurt out his own theories. "The possibility has occurred to us," Kerama said slowly. "It is certainly the most appealing explanation, and it is natural that it should come to your mind, Rick. But it is not the only possible solution." Winston agreed. "There are others that are difficult to explain, unless you have a good background in astrophysics, Rick."

The scientist had spent hours with Kerama and Farid going over the Sanborn tracings, checking the location of the source as shown by the big telescope's position. The change in the source's position, from the time of first discovery to yesterday's checking of the system, had given enough data to calculate its velocity with reasonable accuracy.

The boys followed him into the building, while Hassan squatted in the sun next to his car. The door opened directly into the main control room, a bewildering confusion of panels, instruments, and controls. There were several scientists and technicians clustered around Winston and Kerama. The group was studying Sanborn tracings, continuous graphs showing the lines traced by the incoming signals.

"Was it valuable?" Scotty asked. "More than valuable. It is irreplaceable. In terms of cash, however, the value is around a quarter of a million dollars." Rick whistled. "No wonder the guards watched us this morning." Dr. Kerama called, "Hakim, can you help with these tracings, please?" Farid joined the other scientists, leaving the boys to their own devices.

The formalities of registration were completed, then the Americans went to the cashier and exchanged dollars for Egyptian pounds and coins in units called piastres. They carefully put away their receipts for the exchange, since currency control in the country was strict. "Go ahead," Winston told the boys. "Farid and Kerama will come with me.