"Another thing that needs further work is a mathematical model of the process of mutual capture between Earth and Luna. We know quite a lot about the initial conditions that must have existed before and, of course, a lot more about the conditions that exist now. It would be reassuring to know that for the equations involved there exist solutions that allow one situation to transform into the other within the normal laws of physics. At least, it would be nice to prove that the whole idea isn't impossible.

"Finally, of course, there is the Ganymean ship here. Without doubt a lot of new information is waiting to be discovered—far more than we've had to work on so far. I'm hoping that somewhere in the ship there will be astronomic data to tell us something about the Solar System at the time of the Ganymeans. If, for example, we could determine whether or not the third planet from the Sun of their Solar System had a satellite, or if we could learn enough about their moon to identify it as Luna—perhaps by recognizing Nearside surface features—then the whole theory would be well on the way to being proved.

"This concludes the report.

"Personal addendum for Gregg Caldwell . . ." The view of Hunt was replaced by a landscape showing a wilderness of ice and rock. "This place you've sent us to, Gregg—the mail service isn't too regular, so I couldn't send a postcard. It's over a hundred Celsius degrees below zero; there's no atmosphere worth talking about and what there is, is poisonous; the only way back is by Vega, and the nearest Vega is seven hundred miles away. I wish you were here to enjoy all the fun with us, Gregg—I really do!

"V. Hunt from Ganymede Pithead Base. End of transmission."

Chapter Twenty-Four

The long-awaited answers to where the Lunarians had come from and how they came to be where they had been found sent waves of excitement around the scientific world and prompted a new frenzy of activity in the news media. Hunt's explanation seemed complete and consistent. There were few objections or disagreements; the account didn't leave much to object to or disagree with.

Hunt had therefore met fully the demands of his brief. Although detailed interdisciplinary work would continue all over the world for a long time to come, UNSA's formal involvement in the affair was more or less over. So Project Charlie was run down. That left Project Ganymeans, which was just starting up. Although he had not yet received any formal directive from Earth to say so, Hunt had the feeling that Caldwell wouldn't waste the opportunity offered by Hunt's presence on Ganymede just when the focus of attention was shifting from the Lunarians to the Ganymeans. In other words, it would be some time yet before he would find himself walking aboard an Earth-bound cruiser.