"Huh? Oh, yes!"

"So let's talk about it later."

I said goodnight and ducked into my room quick. William, my boy, I told myself, it's practically in the bag—if you can just keep from getting soft-hearted and agreeing to a split up. I crawled into bed and opened the book.

Ganymede was Jupiter-III; I should have remembered that. It was bigger than Mercury, much bigger than the Moon, a respectable planet, even if it was a moon. The surface gravity was one third of Earth-normal; I would weigh about forty-five pounds there. First contacted in 1985—which I knew—and its atmosphere project started in 1998 and had been running ever since.

There was a stereo in the book of Jupiter as seen from Ganymede—round as an apple, ruddy orange, and squashed on both poles. And big as all outdoors. Beautiful. I fell asleep staring at it.

Dad and I didn't get a chance to talk for the next three days as my geography class spent that time in Antarctica. I came back with a frostbitten nose and some swell pix of penguins—and some revised ideas. I had had time to think.

Dad had fouled up the account book as usual but he had remembered to save the wrappers and it didn't take me long to straighten things out. After dinner I let him beat me two games, then said, "Look, George——"

"Yes?"

"You know what we were talking about?"

"Well, yes."

"It's this way. I'm under age; I can't go if you won't let me. Seems to me you ought to, but if you don't, I won't quit school. In any case, you ought to go—you need to go—you know why. I'm asking you to think it over and take me along, but I'm not going to be a baby about it."

Dad almost looked embarrassed. "That's quite a speech, Son. You mean you're willing to let me go, you stay here and go to school, and not make a fuss about it?"