Frigid conditions had prevailed for three thousand years, since Maleiva and its family of planets plowed into the Quiveras, one of the local dust clouds. They had not yet come out the other side, wouldn't for another eight centuries. The dust filtered the sunlight, and the worlds had cooled. Had there been a civilization on Deepsix, it would not have lived.

The climatologists believed that below fifteen degrees south latitude, and above fifteen degrees north, the snow never melted. Had not melted in these thirty centuries. That wasn't necessarily a long time, as such things went. Earth itself had gone through ice ages of similar duration.

Large land animals had survived. They sighted herds moving through the plains and forests of the equatorial area, which at present formed a green strip across two of the continents. There was also occasional movement out on the glaciers. But along the equatorial strip, a multitude of creatures had hung on.

Beekman got up, took a deep breath, rinsed his coffee cup, clapped Marcel on the shoulder, and beamed. "Have to get ready," he said, starting for the door. "I believe the witching hour has arrived."

When he was gone, Marcel allowed himself a long smile. The host of scientific leaders riding on Wendy had given way to unalloyed enthusiasm. On the way out they'd run and rerun simulations of the Event, discussed its potential for establishing this or that view of energy exchange or chronal consequences or gravity wave punctuation. They argued over what they might finally learn about the structure and composition of gas giants, and about the nature of collisions. They expected to get a better handle on long-standing puzzles, like the tilt of Uranus or the unexplained large iron content of worlds like Erasmus in the Vega system and Mercury at home. And the most important implication: It would be their only opportunity to see directly inside a terrestrial planet. They had special sensors for that, because the eruption of energy, during the final spasm, would be blinding.