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"Come back to the Polaris immediately," said Connel. "We're blasting off in fifteen minutes."

"Very well, sir," said Roger.

Presently the jet boat circled the Polaris and made a landing run for the open port. Roger braked the small craft and brought it to rest alongside the others.

"That's it, spaceboy," he said to Astro. "All out for the Polaris express back home!"

"Just be sure you give me a good course, Manning," grunted Astro, heaving his huge frame out of the small cabin of the jet boat, "and I'll give you all the thrust you want!"

Astro secured the jet boats while Roger closed the air-lock hatch, shutting out the last view of the rugged little planetoid. Roger threw the landscape a mocking kiss.

"So long, Junior! See you back home!" The two cadets climbed the ladder leading to the control deck.

Seated in front of the control panel, Tom watched the sweeping hand of the solar clock. Connel paced nervously up and down behind him. Shinny and Alfie stood to one side also watching the great clock.

"How much time, Corbett?" asked Connel for the dozenth time.

"Junior gets his kick in the pants in ten minutes, sir," replied Tom.

"Fine," said Connel. "That gives me just enough time to notify Space Academy to get ready to receive Junior's signal. You know what to do?"

"I don't have to do anything, sir," answered Tom, nodding to the solar clock over his head. "In nine minutes and twenty seconds, the reactor units go off automatically at one-second intervals."

Roger and Astro entered the control deck and came to attention. Connel returned their salute and put them at ease.

"All right, our work here is done," said Connel. "No point in hanging around any longer. Tom, you can blast off immediately."

"Yes, sir," replied Tom.

Connel climbed the ladder to the radar bridge to contact Space Academy. Astro, Roger, Shinny, and Alfie went to their posts and began quick preparations for the blast-off. One by one, they checked in to Tom on the control deck.

"Power deck, ready to blast off!" reported Astro.

"Radar bridge, all set. Clear trajectory forward and up," said Roger.

"Energize the cooling pumps!" bawled Tom into the intercom.

The great pumps began to wheeze under the strain of Astro's sudden switch to full load without the usual slow build-up. Tom watched the pressure needle rise slowly in front of him and finally reached out and gripped the master switch.

"Stand by to raise ship!" he yelled. "Blast off minus five—four—three—two—one—zeroooooo!"

He threw the switch. The great ship shivered, vibrated, and then suddenly shot away from the precious satellite. Tom quickly adjusted for free fall by switching on the synthetic-gravity gyro generators and then announced over the intercom,

"Major Connel! Cadet Corbett reporting. Ship space-borne at exactly thirty-one, sir!"

"Very well, Corbett," replied Connel. "Space Academy sends the crew a 'well done!' Everything's set back home to take over the beam as soon as Junior starts on his way back. How much time until zero blast-off on the satellite?"

Tom glanced at the clock. "Less than two minutes, sir!"

"All right," said Connel over the intercom, "everybody to the control deck if you want to see Junior do his stuff!"

In a moment the six spacemen were gathered around the magnascope waiting for the final act of their great effort. Breathlessly, their eyes flicking back and forth from the solar clock to the magnascope, they waited for the red hand to sweep around.

"Here it comes," said Tom excitedly. "One second—two seconds—three—four—five!"

On the surface of the planetoid, giant mushrooming clouds appeared climbing into the airless void. One by one the reactor units exploded. Connel counted them as they blew up.

"One, two, three, four, five, six, seven, eight—" he paused. Junior began moving away from them. "Nine!" shouted Connel. "What happened to nine?"

"Roger," shouted Astro, "you made a mistake on the timer!"

"But I couldn't. I—I—"

Connel spun around, his eyes blazing, breathing hard. "What time did you set the last one