"Those were my ideas, too. Both wrong in my case. Let me know if you get any other bright ones." He moved off with a pleasant wave of his hand.

"It will cool," said Ken to Maria. "By the time you're ready to leave I'll be able to drive you home."

"I wouldn't want you to damage your car. I can walk."

"We'll see."

He led her around the house. In the center of the backyard loomed the high, round dome of his amateur observatory. It was Ken's personal pride, as well as that of the members of the Mayfield High Science Club, who had helped build the shell and the mountings. The club used it every Thursday night when the seeing was good.

Ken had ground the precision mirror alone. He had ground his first one, a 4-inch glass, when he was a Boy Scout. Three years later he had tackled the tremendous job of producing a 12-inch one. Professor Douglas of the physics department at the college had pronounced it perfect.

Ken opened the door and switched on the light inside the dome. "Don't mind the mess," he said. "I've been taking photographs of the comet for the last month."

To Maria, who was used to the clutter of a laboratory, there was no mess. She admired the beauty of the instrument Ken and his friends had built. "Our university telescope isn't any better," she said.

"You can't tell by the plumbing," Ken laughed. "Better take a look at the image before you pass judgment."

Skilfully, he swung the long tube around to the direction of the comet. With the fine controls he centered the cross hairs of the eyepiece on the blazing object in the sky.