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Hekla – an ice-age planet in Cold Front (short story, Astounding July 1946).

The blockbuster new novel by science fiction great Hal Clement, set in an alien-run universe created by Isaac Asimov himself. This is the story of six vastly different starfaring races coexisting under a precarious truce — an interstellar community to which the human race has recently been added.

Iceworld is a humorously pointed novel of clashing perspectives, which we may designate as hot versus cold. Even for readers who have not seen H. R. van Dongen's fine cover painting for the novel's first installment in Astounding, Hal Clement does not keep us long in suspense that the planet which is unaccessible because of its climate of extreme cold is our own Earth. In contrast, the dismayed observer, the alien Sallman Ken (also on the cover, not to scale!), is truly hot-blooded. Clement genially introduces mitigating circumstances: Earth, really, is not as bad as all that. Some people are even quite fond of it. Ken, of course, was prejudiced, as anyone is likely to be against a world where water is a liquid — when he has grown up breathing gaseous sulfur and, at rare intervals, drinking molten copper chloride. The mitigating circumstances are mutual, because we have two viewpoint threads alternating here, that of Sallman Ken who is evolved to live comfortably on his quite hot home-planet; Ken is a science teacher, not a scientist or expert but possessing a good general scientific knowledge. The other viewpoint is that of several members of a Terrestrial family who of course are evolved to live comfortably on our quite cold planet. The characters all are engaging, and Iceworld weaves their viewpoints, thoughts, and actions very well. The family on Earth includes young people of various ages, so this is a fine novel for teenagers as well as adults. Sallman Ken has been brought to Earth — or at least as close to it as the Iceworld’s destructive climate will allow — to solve a technical problem for a criminal syndicate of his race. They want a product found on Earth, one which is extremely valuable but so far unsynthesizable. What is it, in its natural state? How to boost their profits by getting or creating more of it? As defined, a general scientific problem, which is why the syndicate has engaged a schoolteacher with an all-around scientific knowledge. This in fact is Clement's own background and profession, so despite Ken's alienness, his character is drawn true to life. The obvious physical barrier and scientific challenge is the scarcely imaginable temperature contrast between the aliens and the world of their interest. A differently tricky difficulty is that the rather unadventurous Ken has been talked into acting as an undercover investigator for his homeworld police. Naturally, the humans on the ground have their own motivations.

Their captors had a very curious system, a very curiousmotivation. The captives were allowed to—even encouraged to—build devices to bring about their escape. Only at the last moment, mysteriously, the capters always stopped them—The problem was: how to escape when a bunch of beings who could practically read your mind were keeping you prisoner?

Hal Clement, one of the all-time greats of science fiction, was defining hard science fiction before such distinctions were even being thought of. He once described his approach to writing: “[T]he rules must be quite simple. They are; for the reader of a science-fiction story, they consist of finding as many as possible of the author’s statements or implications which conflict with the facts as science currently understands them. For the author, the rule is to make as few such slips as he possibly can.” He was named a Grand Master by the Science Fiction and Fantasy Writers of America in 1999 and an annual award for Excellence in Children’s Science Fiction has been established in his memory and is presented each year at the annual Worldcon. This collection presents some of his finest shorter pieces as collected by his friend and colleague, Lester del Rey.

Hal Clement, the dean of hard science fiction, has written a new planetary adventure in the tradition of his classic Mission of Gravity . It is the kind of story that made his reputation as a meticulous designer of otherworldly settings that are utterly convincing because they are constructed from the ground up using established principles of orbital mechanics, geology, chemistry, biology, and other sciences. Kainui is one of a pair of double planets circling a pair of binary stars. Mike Hoani has come there to study the language of the colonists, to analyze its evolution in the years since settlement. But Kainui is an ocean planet. Although settled by Polynesians, it is anything but a tropical paradise. The ocean is 1,700 miles deep, with no solid ground anywhere. The population is scattered in cities on floating artificial islands with no fixed locations. The atmosphere isn’t breathable, and lightning, waterspouts, and tsunamis are constant. Out on the great planetary ocean, self-sufficiency is crucial, and far from any floating city, on a small working-family ship, anything can happen. There are, for instance, pirates. Mike’s academic research turns into an exotic nautical adventure unlike anything he could have imagined.

Clement’s Mission of Gravity was the engaging tale of the adventures of Barlennan, a sea captain among his caterpillar-like people, on the high-gravity world of Mesklin. In Star Light Barlennan and his sailors go with humans to the even stranger world of Dhrawn, a “crusted star” of the type mentioned by Harlow Shapley. Dhrawn circles the feeble red star Lalande 21185, which actually exists (although the planet is fictionalized). Most of the book is the story of a huge landship crossing Dhrawn’s solid surface crewed by these nonhuman sailors, amidst bizarre dangers, and trying to keep Barlennan’s strange plan secret from humans. The characters, despite being mostly from Barlennan’s world, Mesklin, are well drawn and the setting is well realized. Readers bewildered by the melting and freezing of Dhrawn’s ammonia-water hydrosphere will do well to consult a phase diagram. Nominated for Hugo Award for Best Novel in 1971.

The Nitrogen Fix is a 1980 science fiction novel by Hal Clement. The plot revolves around a nomadic family in a future where all oxygen in the Earth's atmosphere has combined with nitrogen, so the atmosphere is mostly nitrogen with traces of water, nitrogen oxides and carbon dioxide, and the seas are very dilute nitric acid. The family is allied with an alien, an octopus-like being who can survive in the new atmosphere. Humans must live in shelters with oxygen-generating plants, or use suitable breathing equipment. Some of Earth's original life forms have mutated to survive in the changed atmosphere. Since almost no metals can exist in the corrosive atmosphere, any technology is based on ceramics or glass. Some humans are suspicious of the aliens, and even blame them for the change to the atmosphere, since they seem to be adapted for it. The family have an almost fatal encounter with a group of such people, who are holding another alien hostage. However, the two aliens are able to pool memories biochemically, so that they become the same personality in two bodies. Their combined knowledge and skills help the humans to escape. At the end the aliens reveal that they are basically tourists or scientists, and they travel from one system to another over thousands of years. Atmospheres "mature" when the nitrogen absorbs all the oxygen, the cause being the inevitable evolution of bacteria that use gold to catalyze the reaction. It is hinted, but not stated outright, that human mining of gold triggered this reaction.

Two alien races lived under a single sun, someplace across the galaxy, sharing their world… sharing life itself. For they lived together in a partnership more perfect than any other known to the intelligences of the galaxy. Together, the two races became one, each deriving from the other that which made him greater than his individual self. Host and symbiote, they lived together, shared together… two bodies in one. For the one race was symbiotic, amorphous, able to enter the body of the other. Then one symbiote turned Criminal, and his race could not rest until he was tracked down. But the Criminal could hide in any living thing… and on Earth there were over two billion humans alone! HAL CLEMENT blends a masterpiece of science fiction with a story of pure detection to produce his best novel, and one of the most famous s-f novels of the past quarter-century.

An expedition team of scientists is exploring the planet Mercury. The constant rumblings of earthquakes and wind have shaken their ship, the Albireo. A small explorative party departs on tractors. It’s then when the volcanic reaction starts. And it looks like the end of the team unless man’s intelligence can beat the malevolent nature of a fiery planet!

The world’s energy was limited… and with overpopulation and a high level of technology, the Power Board had virtually become the real government of the world. Power was rationed, it was guarded, it was sacred. Thus when three of the Power Board’s agents disappeared at sea, and there was evidence that something irregular was happening to the energy quota in that area, it was cause for real alarm.