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  The luminosity seemed to close in behind the spaceship, which slowed and slowed and slowed. The overdrive went off with the sudden pinging sensation which goes all over a person when the overdrive field is released.

  Then, almostly instantly, bells burst into clanging, strident uproar all through the ship. Tommy was almost deafened by the alarm bell which rang in the captain’s room before the quartermaster shut it off with a flip of his hand. But other bells could be heard ringing throughout the rest of the ship, to be cut off as automatic doors closed one by one.

  Tommy Dort stared at the skipper. The skipper’s hands clenched. He was up and staring over the quartermaster’s shoulder. One indicator was apparently having convulsions. Others strained to record their findings. A spot on the diffusedly bright mistiness of a bow-quartering visiplate grew brighter as the automatic scanner focused on it. That was the direction of the object which had sounded collision-alarm. But the object locator itself—. According to its reading, there was one solid object some eighty thousand miles away—an object of no great size. But there was another object whose distance varied from extreme range to zero, and whose size shared its impossible advance and retreat.

  “Step up the scanner,” snapped the skipper.

  The extra-bright spot on the scanner rolled outward, obliterating the undifferentiated image behind it. Magnification increased. But nothing appeared. Absolutely nothing. Yet the radio locator insisted that something monstrous and invisible made lunatic dashes toward the Llanvabon, at speeds which inevitably implied collision, and then fled coyly away at the same rate.

  The visiplate went up to maximum magnification. Still nothing. The skipper ground his teeth. Tommy Dort said meditatively:

  “D’you know, sir, I saw something like this on a liner on the Earth-Mars run once, when we were being located by another ship. Their locator beam was the same frequency as ours, and every time it hit, it registered like something monstrous, and solid.”

  “That,” said the skipper savagely, “is just what’s happening now. There’s something like a locator beam on us. We’re getting that beam and our own echo besides. But the other ship’s invisible! Who is out here in an invisible ship with locator devices? Not men, certainly!”

  He pressed the button in his sleeve communicator and snapped:

  “Action stations! Man all weapons! Condition of extreme alert in all departments immediately!”

  His hands closed and unclosed. He stared again at the visiplate which showed nothing but a formless brightness.

  “Not men?” Tommy straightened sharply. “You mean—”

  “How many solar systems in our galaxy?” demanded the skipper bitterly. “How many planets fit for life? And how many kinds of life could there be? If this ship isn’t from Earth—and it isn’t—it has a crew that isn’t human. And things that aren’t human but are up to the level of deep-space travel in their civilization could mean anything!”

  The skipper’s hands were actually shaking. He would not have talked so freely before a member of his own crew, but Tommy Dort was of the observation staff. And even a skipper whose duties include worrying may sometimes need desperately to unload his worries. Sometimes, too, it helps to think aloud.

  “Something like this has been talked about and speculated about for years,” he said softly. “Mathematically, it’s been an odds-on bet that somewhere in our galaxy there’d be another race with a civilization equal to or further advanced than ours. Nobody could ever guess where or when we’d meet them. But it looks like we’ve done it now!”

  Tommy’s eyes were very bright.

  “D’you suppose they’ll be friendly, sir?”

  The skipper glanced at the distance indicator. The phantom object still made its insane, nonexistent swoops toward and away from the Llanvabon. The secondary indication of an object at eighty thousand miles stirred ever so slightly.

  “It’s moving,” he said curtly. “Heading for us. Just what we’d do if a strange spaceshop appeared in our hunting grounds! Friendly? Maybe! We’re going to try to contact them. We have to. But I suspect this is the end of this expedition. Thank God for blasters!”

  The blasters are those beams of ravening destruction which take care of recalcitrant meteorites in a spaceship’s course when the deflectors can’t handle them. They are not designed as weapons, but they can serve as pretty good ones. They can go into action at five thousand miles, and draw on the entire power output of a whole ship. With automatic aim and a traverse of five degrees, a ship like the Llanvabon can come very close to blasting a hole through a small-sized asteroid which gets in its way. But not on overdrive, of course.

  Tommy Dort had approached the bow-quartering visiplate. Now he jerked his head around.

  “Blasters sir? What for?”

  The skipper grimaced at the empty visiplate.

  “Because we don’t know what they’re like and can’t take a chance! I know!” he added bitterly. “We’re going to make contacts and try to find out all we can about them—especially where they come from. I suppose we’ll try to make friends—but we haven’t much chance. We can’t trust them the fraction of an inch. We daren’t! They’ve locators. Maybe they’ve tracers better than any we have. Maybe they could trace us all the way home without our knowing it! We can’t risk a nonhuman race knowing where Earth is unless we’re sure of them! And how can we be sure? They could come to trade, of course—or they could swoop down on overdrive with a battle fleet that could wipe us out before we knew what happened. We wouldn’t know which to expect, or when!”

  Tommy’s face was startled.

  “It’s all been thrashed out over and over, in theory,” said the skipper. “Nobody’s ever been able to find a sound answer, even on paper. But you know, in all their theorizing, no one considered the crazy, rank impossibility of a deep-space contact, with neither side knowing the other’s home world! But we’ve got to find an answer in fact! What are we going to do about them? Maybe these creatures will be aesthetic marvels, nice and friendly and polite—and underneath with the sneaking brutal ferocity of a Japanese. Or maybe they’ll be crude and gruff as a Swedish farmer—and just as decent underneath. Maybe they’re something in between. But am I going to risk the possible future of the human race on a guess that it’s safe to trust them? God knows it would be worthwhile to make friends with a new civilization! It would be bound to stimulate our own, and maybe we’d gain enormously. But I can’t take chances. The one thing I won’t risk is having them know how to find Earth! Either I know they can’t follow me, or I don’t go home! And they’ll probably feel the same way!”

  He pressed the sleeve-communicator button again. “Navigation officers, attention! Every star map on this ship is to be prepared for instant destruction. This includes photographs and diagrams from which our course or starting point could be deduced. I want all astronomical data gathered and arranged to be destroyed in a split second, on order. Make it fast and report when ready!”

  He released the button. He looked suddenly old. The first contact of humanity with an alien race was a situation which had been forseen in many fashions, but never one quite so hopeless of solution as this. A solitary Earth-ship and a solitary alien, meeting in a nebula which must be remote from the home planet of each. They might wish peace, but the line of conduct which best prepared a treacherous attack was just the seeming of friendliness. Failure to be suspicious might doom the human race,—and a peaceful exchange of the fruits of civilization would be the greatest benefit imaginable. Any mistake would be irreparable, but a failure to be on guard would be fatal.

  The captain’s room was very, very quiet. The bow-quartering visiplate was filled with the image of a very small section of the nebula. A very small section indeed. It was all diffused, featureless, luminous mist.

  “There, sir!”

  There was a small shape in the mist. It was far away. It was a black shape, not polished to mirror-reflection like the hull of the Llanvabon. It was bulbous—roughly pearsh
aped. There was much thin luminosity between, and no details could be observed, but it was surely no natural object Then Tommy looked at the distance indicator and said quietly:

  “It’s headed for us at very high acceleration, sir. The odds are that they’re thinking the same thing, sir, that neither of us will dare let the other go home. Do you think they’ll try a contact with us, or let loose with their weapons as soon as they’re in range?”

  The Llanvabon was no longer in a crevasse of emptiness in the nebulas’ thin substance. She swam in luminesence. There were no stars save the two fierce glows in the nebula’s heart. There was nothing but an all-enveloping light, curiously like one’s imagining of underwater in the tropics of Earth.

  The alien ship had made one sign of less than lethal intention. As it drew near the Llanvabon, it decelerated. The Llanvabon itself had advanced for a meeting and then come to a dead stop. Its movement had been a recognition of the nearness of the other ship. Its pausing was both a friendly sign and a precaution against attack. Relatively still, it could swivel on its own axis to present the least target to a slashing assault, and it would have a longer firing-time than if the two ships flashed past each other at their combined speeds.

  The moment of actual approach, however, was tenseness itself. The Llanvabon’s needle-pointed bow aimed at the alien bulk. A relay to the captain’s room put a key under his hand which would fire the blasters with maximum power. Tommy Dort watched, his brow wrinkled. The aliens must be of a high degree of civilization if they had spaceships, and civilization does not develop without the development of foresight. These aliens must recognize all the implications of this first contact of two civilized races as fully as did the humans on the Llanvabon.

  The possibility of an enormous spurt in the development of both, by peaceful contact and exchange of their separate technologies, would probably appeal to them as to the man. But when dissimilar human cultures are in contact, one must usually be subordinate or there is war. But subordination between races arising on separate planets could not be peacefully arranged. Men, at least, would never consent to subordination, nor was it likely that any highly-developed race would agree. The benefits to be derived from commerce could never make up for a condition of inferiority. Some races—men, perhaps—would prefer commerce to conquest Perhaps—perhaps!—these aliens would also. But some types even of human beings would have craved red war. If the alien ship now approaching the Llanvabon returned to its home base with news of humanity’s existence and of ships like the Llanvabon, it would give its race the choice of trade or battle. They might want trade, or they might want war. But it takes two to make trade, and only one to make war. They could not be sure of men’s peacefulness, nor could men be sure of theirs. The only safety for either civilization would lie in the destruction of one or both of the two ships here and now.

  But even victory would not be really enough. Men would need to know where this alien race was to be found, for avoidance if not for battle. They would need to know its weapons, and its resources, and if it could be a menace and how it could be eliminated in case of need. The aliens would feel the same necessities concerning humanity.

  So the skipper of the Llanvabon did not press the key which might possibly have blasted the other ship to nothingness. He dare not. But he dared not not fire either. Sweat came out on his face.

  A speaker muttered. Someone from the range room.

  “The other ship’s stopped, sir. Quite stationary. Blasters are centered on it, sir.”

  It was an urging to fire. But the skipper shook his head, to himself. The alien ship was no more than twenty miles away. It was deadblack. Every bit of its exterior was an abysmal, nonreflecting sable. No details could be seen except by minor variations in its outline against the misty nebula.

  “It’s stopped dead, sir,” said another voice. “They’ve sent a modulated short wave at us, sir. Frequency modulated. Apparently a signal. Not enough power to do any harm.”

  The skipper said through tight-locked teeth:

  “They’re doing something now. There’s movement on the outside of their hull. Watch what comes out. Put the auxiliary blasters on it.”

  Something small and round came smoothly out of the oval outline of the black ship. The bulbous bulk moved.

  “Moving away, sir,” said the speaker. “The object they let out is stationary in the place they’ve left.”

  Another voice cut in:

  “More frequency modulated stuff, sir. Unintelligible.” Tommy Dort’s eyes brightened. The skipper watched the visiplate, with sweat-droplets on his forehead.

  “Rather pretty, sir,” said Tommy, meditatively. “If they sent anything toward us, it might seem a projectile or a bomb. So they came close, let out a lifeboat, and went away again. They figure we can send a boat or a man to make contact without risking our ship. They must think pretty much as we do.”

  The skipper said, without moving his eyes from the plate:

  “Mr. Dort, would you care to go out and look the thing over? I can’t order you, but I need all my operating crew for emergencies. The observation staff—”

  “Is expendable. Very well, sir,” said Tommy briskly. “I won’t take a lifeboat, sir. Just a suit with a drive in it. It’s smaller and the arms and legs will look unsuitable for a bomb. I think I should carry a scanner, sir.”

  The alien ship continued to retreat. Forty, eighty, four hundred miles. It came to a stop and hung there, waiting. Climbing into his atomic-driven spacesuit just within the Llanvabon’s air lock, Tommy heard the reports as they went over the speakers throughout the ship. That the other ship had stopped its retreat at four hundred miles was encouraging. It might not have weapons effective at a greater distance than that, and so felt safe. But just as the thought formed itself in his mind, the alien retreated precipitately still farther. Which, as Tommy reflected as he emerged from the lock, might be because the aliens had realized they were giving themselves away, or might be because they wanted to give the impression that they had done so.

  He swooped away from the silvery-mirror Llanvabon, through a brightly glowing emptiness which was past any previous experience of the human race. Behind him, the Llanvabon swung about and darted away. The skipper’s voice came in Tommy’s helmet phones.

  “We’re pulling back, too, Mr. Dort. There is a bare possibility that they’ve some explosive atomic reaction they can’t use from their own ship, but which might be destructive even as far as this. We’ll draw back. Keep your scanner on the object.”

  The reasoning was sound, if not very comforting. An explosive which could destroy anything within twenty miles was theoretically possible, but humans didn’t have it yet. It was decidedly safest for the Llanvabon to draw back.

  But Tommy Dort felt very lonely. He sped through emptiness toward the tiny black speck which hung in incredible brightness. The Llanvabon vanished. Its polished hull would merge with the glowing mist at a relatively short distance, anyhow. The alien ship was not visible to the naked eye, either. Tommy swam in nothingness, four thousand light-years from home, toward a tiny black spot which was the only solid object to be seen in all of space.

  It was a slightly distorted sphere, not much over six feet in diameter. It bounced away when Tommy landed on it, feet-first. There were small tentacles, or horns, which projected in every direction. They looked rather like the detonating horns of a submarine mine, but there was a glint of crystal at the tip-end of each.

  “I’m here,” said Tommy into his helmet phone.

  He caught hold of a horn and drew himself to the object. It was all metal, dead-black. He could feel no texture through his space gloves, of course, but he went over and over it, trying to discover its purpose.

  “Deadlock, sir,” he said presently. “Nothing to report that the scanner hasn’t shown you.”

  Then, through his suit, he felt vibrations. They translated themselves as clankings. A section of the rounded hull of the object opened out. Two sections. He worked his way
around to look in and see the first nonhuman civilized beings that any man had ever looked upon.

  But what he saw was simply a flat plate on which dim-red glows crawled here and there in seeming aimlessness. His helmet phones emitted a startled exclamation. The skipper’s voice: “Very good, Mr. Dort. Fix your scanner to look into that plate. They dumped out a robot with an infra-red visiplate for communication. Not risking any personnel. Whatever we might do would damage only machinery. Maybe they expect us to bring it on board—and it may have a bomb charge that can be detonated when they’re ready to start for home. I’ll send a plate to face one of its scanners. You return to the ship.”

  “Yes, sir,” said Tommy. “But which way is the ship, sir?” There were no stars. The nebula obscured them with its light. The only thing visible from the robot was the double star at the nebula’s center. Tommy was no longer oriented. He had but one reference point

  “Head straight away from the double star,” came the order in his helmet phone. “We’ll pick you up.”

  He passed another lonely figure, a little later, headed for the alien sphere with a vision plate to set up. The two spaceships, each knowing that it dared not risk its own race by the slightest lack of caution, would communicate with each other through this small round robot. Their separate vision systems would enable them to exchange all the information they dared give, while they debated the most practical way of making sure that their own civilization would not be endangered by this first contact with another. The truly most practical method would be the destruction of the other ship in a swift and deadly attack—in self-defense.

  II.