Murasaki (novel)


Murasaki is a 1992 "shared universe" hard science fiction novel in six parts to which Poul Anderson, Greg Bear, Gregory Benford, David Brin, Nancy Kress and Frederik Pohl each contributed one chapter; it was edited by Robert Silverberg. It is the first anthology of this type to be entirely conceived and written by winners of the Nebula Award.
The scenery is set in a fictional double planet system in orbit around an actually existing red dwarf star, about 20 light years from our solar system. Because the system had been first explored by a Japanese robot interstellar probe the star has been given the proper name Murasaki. The larger of the two planets is Genji, named after Hikaru Genji, the hero of her novel Genji Monogatari; the smaller one is named Chujo, after Genji's close friend Tō no Chūjō.

Fictional physical characteristics of the Murasaki system

Poul Anderson, who had a degree in physics, worked out the physical framework for the anthology based on the characteristics of HD36395 as they were known in the early 1990s: one third of Earth Sun's mass, 82% of its diameter, spectral type M1 with a photosphere temperature of 3,400 K and a maximum emission in the near infrared.
The twin terrestrial planets are separated by an average distance of only 156,000 km. They orbit around their center of mass in 91 hours in locked rotation, which minimizes the effects of the huge tidal forces which they exert on each other. This constellation orbits Murasaki within the habitable zone, at a distance of only 0.223 astronomical units where the planets receive about the same amount of total irradiation Mars gets from the Sun; however, with a spectral power distribution shifted to much longer wavelengths. From this distance the star appears as a disk of 1° 40' diameter, almost three times as large as the Sun when observed from Earth. Both planets have plate tectonics, causing most of their carbon dioxide being bound in their crusts, and have oxygen-nitrogen atmospheres of Earth-like composition.

Genji

Genji is a Super-Earth but only moderately so: it has 2.8 times the mass and 1.36 times the diameter of Earth, and 1.5 times Earth's gravity. The side of the planet that constantly faces its companion world Chujo is mostly land, the other hemisphere is mostly ocean. The mean surface temperature is +20 °C, slightly warmer than Earth. Although humans in good condition can physically accommodate to the high gravity, the sea level air pressure of 3.1 bars which results from this gravity requires artificial decompression for safe breathing. Only at 5,800 meters the atmospheric pressure drops to Earth-standard 1 bar.

Chujo

This is the smaller world, with 0.76 Earth masses at 94% of its diameter, and 85% of its surface gravity. The mean surface temperature is only +5 °C. Because most of this chilly planet's water is locked in permafrost and glaciers, the atmosphere is not only thin but also uncomfortably dry. From the hemisphere where the companion world Genji can be seen it hangs in the sky as a globe of 6° 20' diameter, and when full gives over 320 times the light of the full Moon as seen from Earth.

Murasaki sapients

There are three sapient races in the system, the Ihrdizu and the himatids on Genji and the Chupchups on Chujo.
The Ihrdizu have evolved on Genji's moonside from an amphibian precursor, a fact which still shows in their poikilothermic regulation of body temperature. They are omnivorous quadrupeds with torpedo-shaped blue-gray, smooth-skinned bodies and a strong tail with two muscular horizontal flukes. Four telescoping eyes are spaced around the head behind the mouth, allowing for almost panoramic vision although the head cannot turn. Two slender tentacles, each terminating in three dextrous digits, grow from below the tympani on each side of the head. An adult female is about two meters long and masses about 100 kg; the adult male is smaller. The Ihrdizu societies are in a broad range of developmental stages from the quasi-paleolithic to the early industrialisation. Cities and wars in the human sense are unknown.
The hermaphroditic himatids have evolved on Genji's predominantly oceanic starside. Their basic form is the ribbon or plate which takes in nourishment and oxygen on its lower side, and excretes on the upper side. Their life cycle starts with caterpillar-sized "wrigglers" which swim ashore and adopt a slug-like existence, growing by addition of cell layers to become "tads." Once they have reached a size of about 40 x 10 cm and are too big to get around readily on land, they follow chemical clues to the tidelands where they join older juveniles, the "calves" which are fully intelligent, mostly aquatic, live in bands, and have a culture about which little is known by human researchers or by the Ihrdizu which used to enslave them. Once the calves are too big for the rough tidal waters they swim to the open sea to become "carpet whales" which measure from 5 meters length upwards, and might live for millennia. This sexually mature final stage no longer uses tools, no longer hunts but grazes, and might either lose recognizable intelligence or spend its time with philosophy.
The outwardly humanoid sapients of Chujo, the Chupchups are mysterious as the story begins to unfold. Before their planet's climate changed to its present harsh conditions thousands of years ago they had reached a stage resembling the Hellenistic civilization on Earth. Their abandoned cities and some self-managing fields are still in evidence, but only about a million of individuals organized in nomadic tribes remain. The Chupchups are clothed in a sort of living rag, in an ectosymbiosis with what is considered a remainder of their former civilization which must have had considerable biotechnology skills. They are literate and keep "libraries" which the tribes visit on a regular basis. Chupchups consistently ignore human researchers' every attempt at communication.

Story plot

''The Treasures of Chujo'' (by Frederik Pohl)

In 2265 C.E. the first human-crewed ship arrives in the Murasaki system after 11 shipboard years of time-dilated relativistic travel. It is actually a hull intended for transport between asteroid habitats in the human solar system which the Spacers have hastily fitted with an interstellar drive after having intercepted the signals from the Japanese robot probe that reported Earth-like planets and intelligent life at Murasaki. As the Japanese expedition force arrives much earlier than had been expected, the Spacers hastily break camp because the first Murasaki samples returned to the human solar system would be the economically most valuable. They leave behind Aaron Kammer, their drive engineer, who had separated from his exploration team on Chujo and is presumed dead.

''World Vast, World Various'' (by Gregory Benford)

The much larger and more professional Japanese expedition systematically explores both planets but fails to establish communication with the Chupchups. As they attempt investigation one of their repositories they are attacked by the troll-like creatures who serve as bodyguards to the intelligent Chujoans. The ruins of the cities reveal mysterious wall paintings and engravings. One such effigy is later found to reflect reality: in the high mountain areas of Chujo, huge mat-like organisms lift off the rocks on excreted hydrogen and form "bioloons" in which several Chupchups attempt to leave the planet; all who try it die.

''Genji'' (by David Brin)

The main base of the Japanese expedition is on Genji, where researchers establish good relations with the Ihrdizu civilization; machine translation between the languages is not perfect but sufficient for simple communication. As the sociology and history of the Ihrdizu are slowly uncovered, it is revealed that not all is as it seems; the race must have gone through many cycles of technological rise and fall; the invention of metallurgy and advance to the equivalent of an early industrial revolution must have occurred at least six or seven times. However, the Ihrdizu are completely unaware of this history. Life itself is at least as old as on Earth but more variegated; instead of ultraviolet radiation and impact events the more labile nature of the biomolecules has acted as the driver of early evolution.

''A Plague of Conscience'' (by Greg Bear)

Four years later, two more ships have arrived: a British-led multinational expedition, and a ragged vessel carrying about 200 members of the Quantist sect from the Southwestern United States. A plague caused by calcium-seeking Chujoan microorganisms has reduced their number to 20, including their leader Carnot who proselytizes among the Ihrdizu communities, preaching an adapted version of his teaching of "Jesus the Physicist" who will at one time reunite the sapients of Genji and Chujo. Integrated into this gospel is Kammer, who has been cured from his injuries by the Chupchups and was brought into a symbiosis with the mat-like organism. Tensions develop between the three groups of emissaries. Kammer, who is barely recognizable as a human being, is brought to Genji to meet Carnot. Both are killed by the Ihrdizu when Kammer goes berserk after realizing that the natives still hunt carpet whales.

''Language'' (by Poul Anderson)

Rita Byrne is dispatched from Genji base station to seek out Malchiel Holden, a reclusive and somewhat sociopathic biologist who investigates the himatides, and has gained some understanding of their habits and body language. Holden accompanies a himatid calf to the open sea where it is supposed to meet with its elders, but runs into two Ihrdizu whaling ships which have harpooned a carpet whale. He sinks one of the vessels, and kills three natives as they try to board his ship. Byrne, who will later marry Holden, witnesses the slaughter from her flyer but is unable to prevent it. Holden defends his actions with an interpretation of Gödel's incompleteness theorems: to understand our own humanity we must study what is as radically different as possible. The Ihrdizu are much too similar to humans in their biology and mentality to serve this purpose.

''Birthing Pool'' (by Nancy Kress)

The year is ca. 2295, almost fifteen years after the last episode. There are seven distinct groups of humans on the planets of the Murasaki system, but only four children have been born here during the past 30 years. Without apparent reason the carpet whales, who normally graze in the polar waters of Genji's Starside, start swimming towards Moonside, converging towards the point where Chujo is exactly overhead. The Holdens alert the other humans to the fact that the carpet whales are projecting an image of Kammer into the atmosphere. At the sub-Genji node on the sister planet, the huge living mats again form bioloons, but this time they transport Chupchups to Genji, guided by bioluminescent signals from the carpet whales. At the same time, all Ihrdizu interrupt whatever activity they are engaged in, and gain access to knowledge that was previously blocked. On Chujo, the aloof Chupchups suddenly seek contact with the humans and present records revealing that all these events are part of a genetically encoded cycle of evolution that knits together all three sapient races in the Murasaki system: the Chupchups bioengineer the Genjian ecology but every time they cause an environmental disaster which results in diebacks and in the breakdown of the Ihrdizu civilization; the carpet whales exile the Chupchups to Chujo so that they can improve their bioengineering, and call them back when the cycle can be started again. The Chupchups' attempt to return to Genji 28 years earlier failed because the Ihrdizu had killed so many carpet whales that no proper guiding signals could be produced.

Significance of the anthology

Besides being a unique collaborative work of the world's foremost science fiction authors of the late 20th century, the Murasaki anthology tells several valuable lessons. First, it demonstrates how difficult it would be to find planets that could be truly colonized by humans. Genji and Chujo both are as terrestrial planets as one could reasonably expect to find, but the relatively minor deviations of their masses from Earth standard result in an atmospheric pressure gradient where unaided breathing is possible only at some places, even though the composition of gases is right for humans. Very few items from the alien biosphere can be safely eaten and/or provide nourishment. The intensity and spectral composition of the sunlight is wrong for humans. As a result, humans must bring their own food or produce it in artificial environments, and exposure to artificial earthly daylight is required to maintain physical and mental health. On Genji the gravity is an inescapable factor that confers both acute and chronic physical risk, and appears to promote dysthymia. In summary this illustrates that even on the most Earth-like planets that might eventually be found, only outposts will be feasible.
The second lesson is that the presence of such human outposts in the Murasaki system has been totally irrelevant to the pre-programmed local cycles of destruction and rebuilding. Neither the initial caution against biological and cultural contamination nor the subsequent missionary efforts among the Ihrdizu have had the slightest effect, simply because the ecosystems as well as the societies are just too alien to suffer or benefit from human actions short of mass slaughter.

Reception

The New York Times Book Review has stated: "It is rare to find a shared-world anthology that adds up to more than the sum of its parts. "Murasaki" is a welcome exception... For all their individual quirks of style and outlook, the contributions fit together like pieces of a puzzle, just as the ecological and evolutionary facts about Genji and Chujo fit together into a grand design that does not become apparent until the end of the book. Of such details are worlds, and stories, made."
Remarkably, the "Murasaki Universe" has not been explored further after the original anthology had been published, although "even these six top-flight writers didn't begin to exhaust the background material."

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