“It’s your exercise period, Buck,” Art Snyder called. Of the five-person crew, he was probably the most officious.

“All right, Pancho,” Herzog sighed. He pushed himself over to the bicycle and began pumping away, at first languigly, then harder. The work helped keep calcium in his bones in spite of free fall. Besides, it was something to do.

Melissa Ott was listening to the news from home. “Fernando Valenzuela died last night,” she said.

“Who?” Snyder was not a baseball fan.

Herzog was, and a California to boot. “I saw him at an old-timers’ game once, I remember my dad and my grandfather always talking about him,” he said. “How old was he, Mel?”

“Seventy-nine,” she answered.

“He always was too heavy,” Herzog said sadly.

“Jesus Christ!”

Herzog blinked. No one on the Ares III had sounded that excited since liftoff from the American space station. Melissa was staring at the radar screen. “Freddie!” she yelled.

Frederica Lindstrom, the ship’s electronics expert, had just gotten out of the cramped shower space. She dove for the control board, still trailing a stream of water droplets. She did not bother with a towel; modesty aboard the Ares III had long since vanished.

Melissa’s shout even made Claude Jonnard stick his head out of the little biology lab where he spent most of his time. “What’s wrong?” he called from the hatchway.

“Radar’s gone to hell,” Melissa told him.

“What do you mean, gone to hell?” Jonnard demanded indignantly. He was one of those annoying people who thought quantitatively all the time, and thought everyone else did, too.

“There are about a hundred, maybe a hundred fifty, objects on the screen that have no right to be there,” answered Frederica Lindstrom, who had a milder case of the same disease. “Range appears to be a couple of million kilometers.”

“They weren’t there a minute ago, either,” Melissa said. “I hollered when they showed up.”