In astronomy, a double planet is a binary satellite system where both objects are planets, or planetary-mass objects, and whose joint barycenter is external to both planetary bodies.
Flat Earth is an archaic and scientifically disproven conception of the Earth's shape as a plane or disk. Many ancient cultures subscribed to a flat-Earth cosmography, notably including ancient near eastern cosmology. The model has undergone a recent resurgence as a conspiracy theory.
Isaac Asimov was an American writer and professor of biochemistry at Boston University. During his lifetime, Asimov was considered one of the "Big Three" science fiction writers, along with Robert A. Heinlein and Arthur C. Clarke. A prolific writer, he wrote or edited more than 500 books. He also wrote an estimated 90,000 letters and postcards. Best known for his hard science fiction, Asimov also wrote mysteries and fantasy, as well as popular science and other non-fiction.
Space is a three-dimensional continuum containing positions and directions. In classical physics, physical space is often conceived in three linear dimensions. Modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. The concept of space is considered to be of fundamental importance to an understanding of the physical universe. However, disagreement continues between philosophers over whether it is itself an entity, a relationship between entities, or part of a conceptual framework.
In physics, gravity (from Latin gravitas 'weight') is a fundamental interaction which causes mutual attraction between all things that have mass. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction. As a result, it has no significant influence at the level of subatomic particles. However, gravity is the most significant interaction between objects at the macroscopic scale, and it determines the motion of planets, stars, galaxies, and even light.
Foundation and Earth is a science fiction novel by American writer Isaac Asimov, the fifth novel of the Foundation series and chronologically the last in the series. It was published in 1986, four years after the first sequel to the Foundation trilogy, which is titled Foundation's Edge.
A Brief History of Time: From the Big Bang to Black Holes is a book on theoretical cosmology by English physicist Stephen Hawking. It was first published in 1988. Hawking wrote the book for readers who had no prior knowledge of physics.
Nemesis is a science fiction novel by American writer Isaac Asimov. One of his later science fiction novels, it was published in 1989, three years before his death. The novel is loosely related to the future history of his Robot Series, Empire Series, and Foundation Series, into which Asimov attempted to integrate his science fiction output. This novel is connected to Asimov's other works by several ideas from earlier and later novels, including non-human intelligence, sentient astronomical bodies ("Hallucination"), and rotor engines.
A scientific theory is an explanation of an aspect of the natural world and universe that can be repeatedly tested and corroborated in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, some theories are tested under controlled conditions in an experiment. In circumstances not amenable to experimental testing, theories are evaluated through principles of abductive reasoning. Established scientific theories have withstood rigorous scrutiny and embody scientific knowledge.
Janet Opal Asimov, usually writing as J. O. Jeppson, was an American science fiction writer, psychiatrist, and psychoanalyst.
The Gods Themselves is a 1972 science fiction novel written by Isaac Asimov, and his first original work in the science fiction genre in fifteen years. It won the Nebula Award for Best Novel in 1972, and the Hugo Award for Best Novel in 1973.
This is a bibliography of the books written or edited by Isaac Asimov, arranged alphabetically. Asimov was a prolific author, and he engaged in many collaborations with other authors. This list may not yet be complete. The total number of books listed here is over 500. Asimov died in 1992 at age 72; a small number of his books were published posthumously.
Fantastic Voyage II: Destination Brain is a science fiction novel by American writer Isaac Asimov, published in 1987. It is about a group of scientists who shrink to microscopic size in order to enter a human brain so that they can retrieve memories from a comatose colleague.
Mesoplanets are planetary-mass objects with sizes smaller than Mercury but larger than Ceres. The term was coined by Isaac Asimov. Assuming size is defined in relation to equatorial radius, mesoplanets should be approximately 500 km to 2,500 km in radius.
The Golden Age of Science Fiction, often identified in the United States as the years 1938–1946, was a period in which a number of foundational works of science fiction literature appeared. In the history of science fiction, the Golden Age follows the "pulp era" of the 1920s and 1930s, and precedes New Wave science fiction of the 1960s and 1970s. The 1950s are, in this scheme, a transitional period. Robert Silverberg, who came of age then, saw the 1950s as the true Golden Age.
Fact and Fancy is a collection of seventeen scientific essays by American writer and scientist Isaac Asimov. It was the first in a series of books collecting his essays from The Magazine of Fantasy and Science Fiction, and Asimov's second book of science essays altogether. Doubleday & Company first published it in March 1962. It was also published in paperback by Pyramid Books as part of The Worlds of Science series.
The Planet That Wasn't is a collection of seventeen scientific essays by American writer and scientist Isaac Asimov. It was the twelfth of a series of books collecting essays from The Magazine of Fantasy and Science Fiction. These essays were first published between December 1974 and April 1976. It was first published by Doubleday & Company in 1976.
In a writing career spanning 53 years (1939–1992), science fiction and popular science author Isaac Asimov (1920–1992) wrote and published 40 novels, 383 short stories, over 280 non-fiction books, and edited about 147 others.
This is a bibliography of American science fiction author Kim Stanley Robinson.
Depending on the counting convention used, and including all titles, charts, and edited collections, there may be currently over 500 books in Isaac Asimov's bibliography—as well as his individual short stories, individual essays, and criticism. For his 100th, 200th, and 300th books, Asimov published Opus 100 (1969), Opus 200 (1979), and Opus 300 (1984), celebrating his writing.
