“No, it’ll lose all its speed by the time it reaches the ship,” Biff told him. “Then they’ll take on fuel from the rocket by means of a long hose.”

Suddenly the three of them heard a loud roar and saw a burst of flame. Like a bullet, the rocket left the muzzle of the giant gun and rose into the sky.

“They’ll be shooting off more rockets before they have enough fuel for the space ship,” Biff said. “There’ll be a little wait in between each firing.”

“Look, Biff, isn’t the space ship right over the canal where we’ll be heading back?” Steve asked.

“That’s right, Steve,” Biff answered. “You’ll remember, our ship is at the end of the canal. We’ll be able to see the rockets go off as we head back—which we’d better do right now, if we’re going to have any turkey and pumpkin pie!”

The canals of Mars had been carved out of a great desert by water and fierce winds. Because of the ice that filled them, they made good highways. The three went to the canal bank to see if their sled was ready to go, and it was. The sled looked like a big bombing plane with the wings off. Instead of wheels, there were long runners beneath it. In this sled Biff and his young helpers had brought supplies to the colony several hours before.

Steve, Sue and Biff climbed into the front seat. Then Biff shut the door. He pushed buttons in front of them. Steve and Sue felt the sled’s engines throbbing. The next moment the sled shot off over the smooth sheet of ice, Biff holding tightly to the steering wheel.

“Wheeeeee!” Sue screamed in delight. “Offffffffff weeeeeeee goooooooooo!”

“Like a rooooller cooooster!” Steve shouted.

They sped along at a hundred miles an hour. This was as much fun as they had had on their last space journey.