Isaac Asimov in the context of "Analog Science Fiction and Fact"

Somnium (Latin for "The Dream") — full title: Somnium, seu opus posthumum De astronomia lunari — is a novel written in Latin in 1608 by Johannes Kepler. It was first published in 1634 by Kepler's son, Ludwig Kepler, several years after the death of his father. In the narrative, an Icelandic boy and his witch mother learn of an island named Levania (the Moon) from a daemon ("Levana" is the Hebrew word for the moon). Somnium presents a detailed imaginative description of how the Earth might look when viewed from the Moon, and is considered the first serious scientific treatise on lunar astronomy. Carl Sagan and Isaac Asimov have referred to it as one of the earliest works of science fiction.

In astronomy, a thalassogen denotes a substance capable of forming a planetary ocean. Thalassogens are not necessarily life sustaining, although most interest has been in the context of extraterrestrial life.

The term was coined by Isaac Asimov in his essay "The Thalassogens", later published in his 1972 collection The Left Hand of the Electron. Said term was coined via the Ancient Greek prefix thalasso- ("sea") and the suffix -gen ("producer").

In science fiction, hyperspace (also known as nulspace, subspace, overspace, jumpspace and similar terms) is a concept relating to higher dimensions as well as parallel universes and a faster-than-light (FTL) method of interstellar travel. In its original meaning, the term hyperspace was simply a synonym for higher-dimensional space. This usage was most common in 19th-century textbooks and is still occasionally found in academic and popular science texts, for example, Hyperspace (1994). Its science fiction usage originated in the magazine Amazing Stories Quarterly in 1931 and within several decades it became one of the most popular tropes of science fiction, popularized by its use in the works of authors such as Isaac Asimov and E. C. Tubb, and media franchises such as Star Wars.

One of the main reasons for the concept's popularity in science fiction is the impossibility of faster-than-light travel in ordinary physical space, which hyperspace allows writers to bypass. In most works, hyperspace is described as a higher dimension through which the shape of three-dimensional space can be distorted to bring distant points close to each other, similar to the concept of a wormhole; or a shortcut-enabling parallel universe that can be travelled through. Usually it can be traversed – the process often known as "jumping" – through a gadget known as a "hyperdrive"; rubber science is sometimes used to explain it. Many works rely on hyperspace as a convenient background tool enabling FTL travel necessary for the plot, with a small minority making it a central element in their storytelling. While most often used in the context of interstellar travel, a minority of works focus on other plot points, such as the inhabitants of hyperspace, hyperspace as an energy source, or even hyperspace as the afterlife.

Hard science fiction is a category of science fiction characterized by concern for scientific accuracy and logic. The term was first used in print in 1957 by P. Schuyler Miller in a review of John W. Campbell's Islands of Space in the November issue of Astounding Science Fiction. The complementary term soft science fiction, formed by analogy to the popular distinction between the "hard" (natural) and "soft" (social) sciences, first appeared in the late 1970s. Though there are examples generally considered as "hard" science fiction such as Isaac Asimov's Foundation series, built on mathematical sociology, science fiction critic Gary Westfahl argues that while neither term is part of a rigorous taxonomy, they are approximate ways of characterizing stories that reviewers and commentators have found useful.

Sir Arthur Charles Clarke CBE FRAS (16 December 1917 – 19 March 2008) was an English science fiction writer, science writer, futurist, inventor, undersea explorer, and television series host.

Clarke was a science fiction writer, an avid populariser of space travel, and a futurist of distinguished ability. He wrote many books and many essays for popular magazines. In 1961, he received the Kalinga Prize, a UNESCO award for popularising science. Clarke's science and science fiction writings earned him the moniker "Prophet of the Space Age". His science fiction writings in particular earned him a number of Hugo and Nebula awards, which along with a large readership, made him one of the towering figures of the genre. For many years Clarke, Robert Heinlein, and Isaac Asimov were known as the "Big Three" of science fiction. Clarke co-wrote the screenplay for the 1968 film 2001: A Space Odyssey, widely regarded as one of the most influential films of all time.

The Left Hand of the Electron is a collection of seventeen nonfiction science essays by American writer and scientist Isaac Asimov, first published by Doubleday & Company in 1972. It was the ninth of a series of books collecting essays from The Magazine of Fantasy and Science Fiction. The title comes from the topic of the first section which deals with chirality of electroweak interactions and chirality of organic compounds and the possible connection between the two. Other essays in this book concern the effect of electron-spin direction on molecular structure e.g. the "Inverse Sugar" (similar to Inverted sugar syrup) in honey with philosophical reflections on the minority of left handedness in general.

Jewish American literature holds an essential place in the literary history of the United States. It encompasses traditions of writing in English, primarily, as well as in other languages, the most important of which has been Yiddish. While critics and authors generally acknowledge the notion of a distinctive corpus and practice of writing about Jewishness in America, many writers resist being pigeonholed as "Jewish voices." Also, many nominally Jewish writers cannot be considered representative of Jewish American literature, one example being Isaac Asimov. Modernism and speculative fiction are major focuses in post-Holocaust Jewish American literature.

Robert Anson Heinlein (/ˈhaɪnlaɪn/ HYNE-lyne; July 7, 1907 – May 8, 1988) was an American science fiction author, aeronautical engineer, and naval officer. Sometimes called the "dean of science fiction writers", he was among the first to emphasize scientific accuracy in his fiction and was thus a pioneer of the subgenre of hard science fiction. His published works, both fiction and non-fiction, express admiration for competence and emphasize the value of critical thinking. His plots often presented provocative situations which challenged conventional social mores. His work continues to have an influence on the science-fiction genre and on modern culture more generally.

Heinlein became one of the first American science-fiction writers to break into mainstream magazines such as The Saturday Evening Post in the late 1940s. He was one of the best-selling science-fiction novelists for many decades. Heinlein, Isaac Asimov, and Arthur C. Clarke are often considered the "Big Three" of English-language science fiction authors. Notable Heinlein works include Stranger in a Strange Land, Starship Troopers (which helped mold the space marine and mecha archetypes) and The Moon Is a Harsh Mistress. His work sometimes had controversial aspects, such as plural marriage in The Moon Is a Harsh Mistress, militarism in Starship Troopers and technologically competent women characters who were formidable, yet often stereotypically feminine—such as Friday.