When she tried to walk, she understood the purpose of the metal-soled shoes. “We scarcely weigh anything now,” their father explained. “The magnetism of our soles is the only thing that keeps us from floating about like a feather.”

The guide, who said his name was Mr. Quinlan, led the sight-seers to a huge window. The young Shannons gasped in wonder at what they saw. The sky was nearly pitch black and filled with more burning lights than they even guessed could exist.

“We’re about a thousand miles above the earth,” Mr. Quinlan said. “We’re out of the earth’s atmosphere and that’s why the sky is dark and the stars so brilliant. Our rear jets are thrusting just barely enough to keep us from being pulled back down to earth.”

The guide next said that they would go outside the ship in space suits. Sue and Steve whooped in joy for they had not expected this. Mr. Quinlan distributed space gear from a cabinet. Then he explained how they were put on. After the flexible suits and plastic helmets were donned, everyone turned on his oxygen, which came from shoulder tanks. The others looked to Steve like balloon toys inflated with air and he had to laugh as they waddled about.

The tourists were led out of a side door onto a balcony which resembled a large fire escape. Everyone was told to buckle himself to the rail by a short length of cord in front of him.

“If one of us were to lose contact with the ship,” Mr. Shannon warned his son and daughter, “he’d go drifting off into space.” Sue and Steve shuddered at the thought of this.

Everyone was told to buckle himself to the rail by a short length of cord

Mr. Quinlan pointed out whirls of misty clouds that were called nebulas. He also showed them star clusters and the brighter planets. The sight-seers had a closeup view of the earth that looked like a shimmering green ball. The guide did his speaking through a small radio attached to his suit. Each tourist had a receiver in his helmet through which he could listen.

For almost a full hour Sue and Steve, together with the other spell-bound passengers, took in the splendor of this strange silent place, the vastness of which staggered the imagination.