He heard indrawn breaths, like his own on the bridge, and saw eyes grow white-rimmed, lips flutter, fingers trace signs in the air. He persisted: “We cannot do much to prepare. A little battening down, yes; but in general, the ship is already as taut as can be. When the moment approaches, we will be in shock harness and space armor. So— The meeting is now open for discussion.” Williams’ hand rocketed past the shoulder of tall M’Botu. “Yes?”

The chemist’s ruddiness showed indignation rather than fear. “Mister Captain! The robot probe observed no dangers on this route. At least, it beamed back no hint of them. Right? Who’s responsible for our blundering into this muck?”

Voices lifted toward a babble. “Quiet!” Charles Reymont called. Though he didn’t speak loud, he pushed the sound from his lungs in such a way that it struck. Several resentful glances were cast at him, but the talkers came to order.

“I thought I had explained,” Telander said. “The cloud is minute by cosmic standards, nonluminous, undetectable at any large distance. It has a high velocity, scores of KPS. Thus, supposing the probe had taken our identical path, the nebulina would have been well offside at the time— more than fifty years ago, remember. Furthermore… we can be certain the probe did not go exactly as we are going. Besides the relative motion of Sol and Beta Virginis, consider the distance between. Thirty-two light-years is more than our poor minds can picture. The slightest variation in the curves taken from star to star means a difference of many astronomical units in the middle.”

“This thing couldn’t have been predicted,” Reymont added. “The chances were big against our running into it. Still, somebody has to draw the long odds now and then.”

Telander stiffened. “I did not recognize you. Constable,” he said.

Reymont flushed. “Captain, I was trying to expedite matters, so some snotbrains won’t keep you here explaining the obvious till we smash.”

“No insults to shipmates. Constable. And kindly wait to be recognized before you speak.”

“I beg the captain’s pardon.” Reymont folded his arms and blanked his features.

Telander said with care: “Please do not be afraid to ask questions, however elementary they seem. You are all educated in the theory of interstellar astronautics. But I, whose profession this is, know how strange the paradoxes are, how hard to keep straight in one’s mind. Best if everyone understands exactly what we are meeting… Dr. Glassgold?”

The molecular biologist lowered her hand and said timidly: “Can’t we— I mean— nebular objects like mat, they would count as hard vacuums on Earth. Wouldn’t they? And we, we are just under the speed of light, gaining more every second. And so more mass. Our inverse tau is about fifteen at the moment, I believe. That means our mass is enormous. So how can a bit of dust and gas stop us?”

“A good point,” Telander replied. “If we are lucky, we will pass without too great hindrance. Not entirely. Remember, that dust and gas is moving equally fast with respect to us, with a corresponding increase of its mass.