“Oh—you mean that other guy?” said Tubby.
The professor calmed himself with an effort. He pulled a huge black silk handkerchief from his pocket and mopped his dripping forehead.
“We won’t talk of him,” he said after a moment.
“No, we better leave him out of it,” Tubby agreed. “Ain’t I right?”
The professor nodded. “Now we come to my great discovery. I’ll tell you about that now.
“When this sunlight is reflected from the moon to us, it brings with it an image of the moon, which was not in the light when it left the sun. Do you understand?”
“No—yes,” said Tubby.
“That’s why we can see the moon—the light brings us the image. All light carries an image of something—that’s why we can see things.
“Now when light leaves the earth and goes out into space it takes with it an image of the earth and everything that is happening on the earth.”
“Right,” said Tubby. “Go on.”