Star Light

Star Light

Infobox Book
name = Star Light
title_orig =
translator =

image_caption = Cover of second edition (paperback)
author = Hal Clement
illustrator =
cover_artist = H. R. Van Dongen
country = United States
language = English
series = Mesklin
genre = Science fiction novel
publisher = Ballantine Books
release_date = June - September 1970 (serial)
September 1971 (book)
english_release_date =
media_type = Print (Magazine, Paperback & Hardback)
pages = 279 (paperback)
isbn = 0-345-27358-3
preceded_by = Mission of Gravity
followed_by =

"Star Light" is a science fiction novel by Hal Clement. It is the sequel to one of Clement's earlier books, "Mission of Gravity". The novel was serialized in four parts in "Analog Science Fiction/Science Fact Magazine" from June to September 1970. "Star Light" was first published as a paperback book by Ballantine Books in September 1971.

Plot summary

The story is set several decades after the events of "Mission of Gravity". It takes place mostly on the supergiant planet "Dhrawn", which some suspect of being a failed star. The planet has an ammonia/water atmosphere with some oxygen, at temperatures ranging from 70 degrees Kelvin to almost the freezing point of water. The planet rotates extremely slowly, taking around two months for one revolution. It also has a long eccentric orbit around its star, which is a red dwarf, Lalande 21185. Much of the planet's heat seems to come from within. The gravity at the surface is 40 times the Earth's. Almost everything about the planet defies scientific theory, including its size, lack of hydrogen, its temperature, and the presence of free oxygen in its atmosphere.

A consortium of spacefaring races, including humans, recruits Mesklinites, the centipede-like natives of the high-gravity planet Mesklin, to explore Dhrawn. The recruits include Barlennan and Dondragmer, respectively the Captain and First Mate of the "Bree", a merchant vessel of Mesklin, which sailed to Mesklin's south pole to rescue a probe sent by humans. Now, thanks to institutes of learning set up on Mesklin, the natives have produced capable explorers who can go where other races cannot.

Barlennan is in command of the main base on Dhrawn while Dondragmercommands a "land cruiser", the "Kwembly". This is a tracked vehicle about 30 meters long, 6 meters high and the same wide. It is designed to move like a large worm on independently steerable trucks. The power is supplied by self-contained fusion generators but the controls are simple pulley-and-rope systems using Mesklinite materials which the crew can repair themselves. There are several more cruisers, and each has audio/video links for communication with satellites.

The humans and others are on a satellite in synchronous orbit above the explorers on the ground. Unfortunately the planet's slow rotation means that they are about 10 million kilometers above the surface, and signals take over 30 seconds to travel to the satellite. Real time conversations are therefore impossible.

On the satellite are linguist "Easy" Hoffman and her son Benj, who is both an engineer and a linguist. Both speak fluent "Stennish", the Mesklinite language, and have formed close personal relationships with the explorers on the surface. They are later joined on the satellite by Ib Hoffman, Easy's husband and Benj's father.

One of the cruisers, the "Esket" has apparently suffered a catastrophe and all the crew have vanished, much to Easy's dismay. The cruisers communicators still function, but all they show are views of a deserted ship.

In reality, Barlennan is executing a complicated deception. A wily negotiator who successfully blackmailed the humans into giving him technology in "Mission of Gravity", he is apparently plotting to gain yet another advantage from the situation he created. The exact nature of his objectives is unclear.

Soon, however, the "Kwembly" is in very real trouble. As the planet warms, the complicated phase changes of water and ammonia mixures at these low temperatures mean that a frozen lake can melt in seconds, carry the ship off in a flood, and equally suddenly leave it hung up on large rocks, unable to move as the liquid around it freezes again, trapping some of the crew below the surface in their protective suits.

These events, along with some bad timing, lead to the discovery of Barlennan's trickery when Easy recognizes a friend of hers from the "Esket" as he appears, as if from nowhere, but actually from one of the dirigibles that Barlennan is clandestinely using to move his men and materiel around.

The Hoffmans would prefer to deal honestly with the Mesklinites, but they have to deal with the prejudices, not only of fellow humans with political motives, but with the more paranoid of the non-human supervisors of the mission. Having an inkling of what Barlennan is really after, Ib Hoffman finally breaks the deadlock with an idea that will save the crew of the "Kwembly" and make the mission successful beyond the dreams of its planners.


As might be expected from the author, the main theme revolves around hard science, particularly the physics and thermodynamics of mixtures. While water should be in the form of ice at all times on "Dhrawn", the effect of ammonia in the atmosphere is to cause it to become a liquid under certain conditions of temperature and pressure, because of the formation of a eutectic mixture which melts and freezes at a much lower temperature than water. Although the scientists on the satellite attempt to supply weather forecasts for the Mesklinites, they are using tools designed for Earth's weather to predict conditions in a two-component water/ammonia system instead of Earth's one-component system. Even local effects, such as liberation of latent heat from mixtures undergoing freezing or condensation, can produce drastic changes in conditions. Seemingly solid surfaces can liquefy under the pressure of the land cruisers, even as individual Mesklinites can walk on them in complete safety.

To some extent, the narrative is much weakened by the focus on the science. There are long passages of exposition intended to show both what can go wrong in a seemingly well-understood situation, and how individual ingenuity and perseverance can overcome problems. The human characters seem made-up and lacking in depth, simply being people with extraordinary abilities trying to deal with a situation where they are getting information that is late and, they later realize, unreliable.

The final lesson in the novel is that full and complete disclosure is the only way to succeed in a situation where unpredictable changes can occur. Ib Hoffman relates the story of how his son Benj, at the age of thirteen, designed and built SCUBA equipment, carefully calculating all the parameters, only to come close to dying on his first dive because he lacked a crucial piece of information about the physiology of breathing, one which all his knowledge of physics and engineering could not have predicted.

External links

* [ "Star Light" at the ISFDB]

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