whistled into the tunnel 
beneath the mountain range, the boys of the Polaris unit returned to 
their seats. 
"Back to the old grind," sighed Roger. "Drills, maneuvers, books, 
lectures. The same routine, day in day out." 
"Maybe not," said Tom. "Remember, the order for us to report back 
was signed by Commander Walters, not the cadet supervisor of leaves. 
I think that means something special." 
Suddenly the monorail roared out of the tunnel and into brilliant 
early-morning sun again. 
The three cadets turned quickly, their eyes sweeping the valley for the 
first sight of the shining Tower of Galileo. 
"There it is," said Tom, pointing toward a towering crystal building 
reflecting the morning light. "We'll be there in a minute." 
Even as Tom spoke, the speed of the monorail slackened as it eased 
past a few gleaming structures of aluminum and concrete. Presently the 
white platform of the Academy station drifted past the viewport and all 
forward motion stopped. The doors opened and the three boys hurried 
to the exit. 
All around the cadets, men and women in the vari-colored uniforms of 
the Solar Guard hurried through the station. The green of the 
Earthworm cadets, first-year students of the Cadet Corps; the brilliant 
rich blue of the senior cadets like the Polaris unit; the scarlet red of the 
enlisted Solar Guard; and here and there, the black and gold of the 
officers of the Solar Guard. 
The three cadets hurried to the nearest slidewalk, a moving belt of 
plastic that glided silently across the ground toward Space Academy. It
whisked them quickly past the few buildings nestled around the 
monorail station and rounded a curve. The three cadets looked up 
together at the gleaming Tower of Galileo. Made of pure Titan crystal, 
it soared above the cluster of buildings that surrounded the grassy 
quadrangle and dominated Space Academy like a translucent giant. 
The cadets stepped off the slidewalk as it glided past the Tower 
building and ran up the broad marble stair. At the huge main portal, 
Tom stopped and looked back over the Academy grounds. All around 
him lay the evidence of mankind's progress. It was the year 2353, when 
Earthman had long since colonized the inner planets, Mars and Venus, 
and the three large satellites, Moon of Earth, Ganymede of Jupiter, and 
Titan of Saturn. It was the age of space travel; of the Solar Alliance, a 
unified society of billions of people who lived in peace with one 
another, though sprawled throughout the universe; and the Solar Guard, 
the might of the Solar Alliance and the defender of interplanetary peace. 
All these things Tom saw as he stood in the wide portal of the Tower 
Building, flanked by Astro and Roger. 
Turning into the Tower, the three cadets went directly to the office of 
their unit commander. The training program at Space Academy 
consisted of three cadets to a unit, with a Solar Guard officer as their 
teacher and instructor. Steve Strong, captain in the Solar Guard, had 
been their cadet instructor since the unit had been formed and he now 
smiled a welcome as the cadets snapped to attention in front of his 
desk. 
"Polaris unit reporting as ordered, sir," said Tom, handing over the 
audiogram order he had received the day before. 
"Thank you, Corbett," said Strong, taking the paper. "At ease." 
The three boys relaxed and broke into wide grins as Strong rounded his 
desk and shook hands with each of them. 
"Glad to have you back, boys," he said. "Did you enjoy your leave?" 
"And how, sir," replied Tom.
"Tom's mother showed us a whale of a good time," chimed in Roger. 
"And how she can cook!" Astro licked his lips involuntarily. 
"Well, I hope you had a good rest--" said Strong, but was suddenly 
interrupted by the sound of a small bell. Behind his desk a small 
teleceiver screen glowed into life to reveal the stern face of 
Commander Walters, the commander of Space Academy. 
Strong turned to the teleceiver and called, "Yes, Commander Walters?" 
"Did the Polaris unit arrive yet, Steve?" asked the commander. 
"Yes, sir," replied Strong. "They're here in my office now, sir." 
"Good," said the commander with a smile. "I just received a report the 
exposition will open sooner than expected. I suggest you brief the 
cadets and raise ship as soon as possible." 
"Very well, sir," answered Strong. The screen darkened and he turned 
back to the cadets. "Looks like you got back just in time." 
"What's up, sir?" asked Tom. 
Strong returned to his chair and sat down. "I suppose you've all heard 
about the Solar Exposition that opens on Venus next week?" 
Tom's eyes lit up. "Have we! That's all the stereos and visunews and 
teleceivers have been yacking about for weeks now." 
"Well," said Strong with    
    
		
	
	
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