indigenous help.
Anu light lay sinister across a slice which ought to have been dark. By that dull glow he picked out the continents he had read about. Conway had tried to teach him how to utter their names.
Australia-sized Haelen decked the south pole, extending an arm past the Antarctic Circle. Thence a series of archipelagos, visible from here only as changes in the pattern of clouds and currents, led north to Beronnen, roughly India-shaped, dry land from a bit south of the southern tropic to a bit south of the equator. Beyond were more islands, many volcanic—could he identify murkiness in some of the clouds?—until his eye reached Valennen, not far north of the equator. Like a Siberia stood on end, it stretched nearly to the north pole. The curve of the planet hid its further three quarters from Dejerine, that unknown territory whose life had not been born on Ishtar.
He searched for the rest of his command, parked in advance of him, but failed to see any vessel. No surprise; they were widely spaced for safety and radio relay. Their names made a litany in his head: Sierra Nevada, where he was; ranger Moshe Peretz, first vessel he had skippered; scout mother Isabella, who bore in her womb ten wasps; workshop Imhotep, which the fighting craft were here to serve and protect. Yes, he thought, he’d come a long way, spectacularly fast, in two senses. That he had been dispatched here, remote from action, was in truth an honor, a mark of trust.
Nevertheless, since his duties were off him for a while, the control bridge felt like a cell. He rose and left it, in search of what home existed in his cabin. His shoes clacked loudly on empty decks. During the voyage he had had the field generators set for 1.18 g. His men and he must arrive at Ishtar with bodies adapted to its heavier pull. Tired, he felt the fourteen kilos added to his weight as if it were lead hung at shoulders and ankles.
Well, he’d be okay after a nap.
But when he had exchanged high-collared blue tunic and white trousers for pajamas, his hermit’s bed held no attraction. He decided to allow himself a small cognac, and lit a cigarette. For a few minutes he prowled about looking at personal things.
His father’s picture… Why didn’t he keep his mother’s? Their marriage had broken when he was six, their sole child, and she had reared him. She had been conscientious about it, too, as much as a growingly important administrative job in the Peace Control Authority permitted. Their life hadn’t lacked excitement, either— frequent moves to different European cities, vacation trips to the rest of Earth and to Luna, parties where eminent guests discussed matters big in the news… Yet somehow, maybe because they rarely saw each other, maybe because he was always cheerful, ambitious for little more than the enjoyment of life, Pierre Dejerine came through to the son in a way that Marina Borisovna never could… though surely a part of her in that boy had seen him through the Naval Academy, even if it was a part of his father that had sparked him to apply…
The captain shook his head and grinned at the contents. If he must be stuffy-serious, why not put the mood to use and read over what he had on Ishtar? If nothing else, the boredom of this latest repetition might make him sleepy.
He took the best of the books, relaxed in the lounger, sipped brandy and smoke, and began leafing through.
—Babylonian nomenclature. Other Terrestrial mythologies were spent on planetary systems nearer home. But by chance, the Anubelean was among the first visited, so soon after Mach’s Principle led to the cracking of the light-speed barrier that Diego Primavera’s voyage was an epic of daring.
His main goal was the globular cluster NGC 6656 (M 22) in Sagittarius. At three kiloparsecs’ remove, this is comparatively close, and additionally of special interest to astrophysicists for being smalt and dense: thus a good place to begin research on groups of its kind. Spacehome instruments had picked out an isolated stellar system much nearer, which happens in this epoch to be on a direct line between Sol and the cluster heart. That background had camouflaged it from Earthside astronomers, and confused the results of observation from orbit. Accordingly, Primavera’s ship was scheduled to visit it en route.
What he found there was vastly more exciting than what he was bound for—from a biological and psychological, hence human viewpoint. Bear in mind how new in galactic space man was. He had not hitherto come upon worlds at once so like his home and so remarkably unlike.
Primavera led a second expedition for the specific purpose of exploring those planets. His report caused a sensation. A scholarly dilettante, Winston P. Sanders, proposed the Babylonian names as being appropriate on numerous counts, and the suggestion was soon adopted…
However, by that time travelers who had gone elsewhere were bringing a flood of exotic tales… Anubelean studies languished until a global association of scientific and humanistic institutions had been founded and funded… Not only the fascination of Ishtar and Tammuz spoke for establishing a permanent base on the former. A wish to help the living natives through the next of those crises which had dogged their entire history, indeed their evolution…
Rhetoric. Dejerine wanted dullness. He skipped to a chapter self-proclaimed as dryly factual.
Per se, the system is nothing extraordinary. Companion stars often have widely differing masses, therefore developmental histories, and eccentric orbits are more a rule than an exception.
The three members of Anubelea seem to be approximately as old as Sol. Hence Bel, the G2 star, can expect four or five billion years of steady shining in the future. Ea, the red dwarf, will endure far longer than that. But Anu, the most massive, has inevitably aged faster. It is not enormously bigger than Bel, 1.3 times, which is to say the mass is 1.22 Sol. In its heyday it did not shine too fiercely for at least one of its planets to spawn protein-in-water life and oxygen-releasing photosynthesis. But perhaps—we continue pathetically ignorant—the greater irradiation hastened evolution. Whatever the causes, we do know that about a billion years ago, Tammuz (Anu III) had brought forth intelligent beings who had in turn brought forth a technological civilization.
By then, their sun had burned sufficient hydrogen that it could no longer stay on the main sequence. It had begun to swell, to become a red giant. At present its total luminosity equals 280 Sols; and this is slowly, inexorably rising.
To understand the situation on Ishtar, let us imagine its sun, Bel, as stationary, Anu and Ea revolving around it. Needless to say, in actuality the three stars move around a common center of mass. But given their changing configurations, only mathematics can well describe this. (See Appendix A.) A Bel-centered diagram is valid geometrically, to a first approximation, though false dynamically.
In this picture, Anu moves around Bel in a huge ellipse. At its maximum distance, it is some 224 astronomical units off, scarcely more than the chief star in the skies of Ishtar. At closest approach, it comes within 40 astronomical units of Bel, i.e., between about 39 and 41 of Ishtar, depending on the planetary position. The orbital period is 1,041 Terrestrial years. That is, each millennium the red giant sweeps near…
The path of Ea is still more majestic and eccentric. It is always too remote to have a measurable direct effect, although it looms large in every known Ishtarian mythology. And it is interesting in its own right for the single planet it possesses, a superjovian…
In the present epoch—which for all practical purposes covers millions of past and future years—Anu at periastron to Bel adds approximately 20 per cent to the irradiation which Ishtar normally receives. This corresponds to a rise in black body temperature of 11° C.
Theoretical calculations must be used carefully. A planet, especially if it has atmosphere and hydrosphere, is not a black body. For example, heat will cause the formation of clouds from evaporated water, which will reflect back more radiation than formerly; but meanwhile greenhouse effect will operate the more strongly as more water vapor enters the air. And then there are the differing, though always large, thermal inertias of various regions…
Since periastron passage is necessarily rapid, the time during which Anu is important to Ishtar is arbitrarily estimated at a century. As it approaches, at first there is small result except its increasing apparent size and brightness. Time is needed to heat an entire planet. Storms, droughts, and similar disasters do not become major until about the period when Anu is closest. Thereafter, while the red giant recedes, they grow progressively worse—just as the hottest time of an ordinary year comes after the summer solstice and may last beyond the autumnal equinox.
All in all, it is thus for about one century out of ten that nature on Ishtar is in turmoil…
Having no large moon. the planet processes slowly. Through this past geological era, the inclinations of orbits and spin axes have made Ishtar’s northern hemisphere bear the brunt. If periastron occurs at midwinter, Arm will be ca. 26° from the north celestial pole; if at midsummer, ca, 28°. This means that these co-latitudes get the maximum exposure. Their temperatures rise well above the “theoretical,” with everything that that implies. At their
