Information:  - Donald Allen Wollheim (October 1, 1914  November 2, 1990) was an American science fiction editor, publisher, writer, and fan. As an author, he published under his own name as well as under pseudonyms, including David Grinnell.  - Historical fantasy is a category of fantasy and genre of historical fiction that incorporates fantastic elements (such as magic) into the narrative. There is much crossover with other subgenres of fantasy; those classes as Arthurian, Celtic, or Dark Ages could just as easily be placed in Historical Fantasy. Stories fitting this classification generally take place prior to the 20th century.  - Fantasy is a fiction genre set in an imaginary universe, often but not always without any locations, events, or people from the real world. Most fantasy uses magic or other supernatural elements as a main plot element, theme, or setting. Magic and magical creatures are common in many of these imaginary worlds. Fantasy is generally distinguished from the genres of science fiction and horror by the expectation that it steers clear of scientific and macabre themes, respectively, though there is a great deal of overlap between the three, all of which are subgenres of speculative fiction.  - Andre Alice Norton (born Alice Mary Norton, February 17, 1912  March 17, 2005) was an American writer of science fiction and fantasy with some works of historical fiction and contemporary fiction. She wrote primarily under the pen name Andre Norton, but also under Andrew North and Allen Weston. She was the first woman to be Gandalf Grand Master of Fantasy, first to be SFWA Grand Master, and first inducted by the Science Fiction and Fantasy Hall of Fame.  - Speculative fiction is a broad umbrella genre denoting any narrative fiction with supernatural or futuristic elements; this encompasses the genres of science fiction, fantasy, horror, alternative history, magic realism, and superhero fiction, as well as combinations of the previous genres. It typically strays strongly from reality and so may feature fictional types of beings like mythical creatures and supernatural entities, technologies that do not exist in real life like time machines and interstellar spaceships, or magical or otherwise scientifically inexplicable elements. The term's popularity is sometimes attributed to Robert Heinlein, who referenced it in 1947 in an editorial essay, although there are prior mentions of speculative fiction, or its variant "speculative literature".  - Leroni of Darkover is an anthology of fantasy and science fiction short stories edited by Marion Zimmer Bradley . The stories are set in Bradley 's world of Darkover . The book was first published by DAW Books ( No. 865 ) in November , 1991 .  - A novel is a long narrative, normally in prose, which describes fictional characters and events, usually in the form of a sequential story.  - A planet is an astronomical body orbiting a star or stellar remnant that The term "planet" is ancient, with ties to history, astrology, science, mythology, and religion. Several planets in the Solar System can be seen with the naked eye. These were regarded by many early cultures as divine, or as emissaries of deities. As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects. In 2006, the International Astronomical Union (IAU) officially adopted a resolution defining planets within the Solar System. This definition is controversial because it excludes many objects of planetary mass based on where or what they orbit. Although eight of the planetary bodies discovered before 1950 remain "planets" under the modern definition, some celestial bodies, such as Ceres, Pallas, Juno and Vesta (each an object in the solar asteroid belt), and Pluto (the first trans-Neptunian object discovered), that were once considered planets by the scientific community, are no longer viewed as such.  - The Mists of Avalon is a 1983 fantasy novel by Marion Zimmer Bradley, in which she relates the Arthurian legends from the perspective of the female characters. The book follows the trajectory of Morgaine (often called Morgan le Fay in other works), a priestess fighting to save her matriarchal Celtic culture in a country where patriarchal Christianity threatens to destroy the pagan way of life. The epic is focused on the lives of Gwenhwyfar, Viviane, Morgause, Igraine and other women who are often marginalized in Arthurian retellings. King Arthur and the Knights of the Round Table are supporting rather than main characters.  - Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe.  - Extraterrestrial life, also called alien life (or, if it is a sentient or relatively complex individual, an "extraterrestrial" or "alien"), is life that does not originate from Earth. These as-yet-hypothetical life forms may range from simple single-celled organisms to beings with civilizations far more advanced than humanity. Although many scientists expect extraterrestrial life to exist, there is no unambiguous evidence for its existence so far. The science of extraterrestrial life is known as exobiology.  - Ace Books is an American specialty publisher of science fiction and fantasy books. The company was founded in New York City in 1952 by Aaron A. Wyn and began as a genre publisher of mysteries and westerns. It soon branched out into other genres, publishing its first science fiction (sf) title in 1953. This was successful, and science fiction titles outnumbered both mysteries and westerns within a few years. Other genres also made an appearance, including nonfiction, gothic novels, media tie-in novelizations, and romances. Ace became known for the "tête-bêche" binding format used for many of its early books, although it did not originate the format. Most of the early titles were published in this "Ace Double" format, and Ace continued to issue books in varied genres, bound "tête-bêche", until 1973.  - Science fiction (often shortened to SF, sci-fi or scifi) is a genre of speculative fiction, typically dealing with imaginative concepts such as futuristic science and technology, space travel, time travel, faster than light travel, parallel universes, and extraterrestrial life. Science fiction often explores the potential consequences of scientific and other innovations, and has been called a "literature of ideas." It usually avoids the supernatural, and unlike the related genre of fantasy, historically science fiction stories were intended to have a grounding in science-based fact or theory at the time the story was created, but this connection is now limited to hard science fiction.  - Darkover is the focus planet of the Darkover series of science fiction-fantasy novels and short stories by Marion Zimmer Bradley and others published since 1958. According to the novels, Darkover is the only human-habitable of seven planets orbiting a fictional red giant star called Cottman. The word "Darkover" is a registered trademark owned by the Marion Zimmer Bradley Literary Works Trust.  - The Darkover series is a science fiction-fantasy chronology consisting of several novels and short stories set in the fictional world of Darkover as created by author Marion Zimmer Bradley. The word "Darkover" is a registered trademark owned by the Marion Zimmer Bradley Literary Works Trust.  - The supernatural (Medieval Latin: "superntrlis": "supra" "above" + "naturalis" "natural", first used: 15201530 AD) includes all that cannot be explained by science or the laws of nature, including things characteristic of or relating to ghosts, gods, or other supernatural beings, or to things beyond nature.  - Science fantasy is a mixed genre within the umbrella of speculative fiction which simultaneously draws upon and/or combines tropes and elements from both science fiction and fantasy. It also sometimes incorporates elements of horror fiction.  - Spell of the Witch World is a collection of short fiction by science fiction and fantasy author Andre Norton, forming part of her Witch World series. It was first published in paperback by DAW Books in April 1972, and has been reprinted numerous times since. It has the distinction of being the first book released by that publisher. Early printings had cover art and a frontispiece by artist Jack Gaughan; later printings replaced the cover art (but not the frontispiece) with new art by Michael Whelan. The first hardcover edition was a photographic reprint of the DAW edition published by Gregg Press in 1977. It featured a new frontispiece by Alice D. Phalen and endpaper maps of the Witch World by Barbi Johnson.  - Time travel is the concept of movement (such as by a human) between certain points in time, analogous to movement between different points in space, typically using a hypothetical device known as a time machine, in the form of a vehicle or of a portal connecting distant points in time. Time travel is a recognized concept in philosophy and fiction, but traveling to an arbitrary point in time has a very limited support in theoretical physics, and usually only in conjunction with quantum mechanics or wormholes, also known as Einstein-Rosen bridges. In a more narrow sense, one-way time travel into the future via time dilation is a well-understood phenomenon within the frameworks of special relativity and general relativity, but advancing a large amount of time is not feasible with current technology. The concept was touched upon in various earlier works of fiction, but was popularized by H. G. Wells' 1895 novel "The Time Machine", which moved the concept of time travel into the public imagination, and it remains a popular subject in science fiction.  - Marion Eleanor Zimmer Bradley (June 3, 1930  September 25, 1999) was an American author of fantasy, historical fantasy, science fiction, and science fantasy novels, and is best known for the Arthurian fiction novel "The Mists of Avalon", and the Darkover series. While some critics have noted a feminist perspective in her writing, her popularity has been posthumously marred by multiple accusations against her of child sexual abuse and rape by two of her children, Mark and Moira Greyland, among many others. Zimmer Bradley's first child, David R. Bradley, and her brother, Paul Edwin Zimmer, also became published science fiction and fantasy authors.  - DAW Books is an American science fiction and fantasy publisher, founded by Donald A. Wollheim following his departure from Ace Books in 1971. The company therefore claims to be "the first publishing company ever devoted exclusively to science fiction and fantasy." The first DAW Book published was the 1972 short story collection "Spell of the Witch World" by Andre Norton.  - Hard science fiction is a category of science fiction characterized by an emphasis on scientific accuracy. The term was first used in print in 1957 by P. Schuyler Miller in a review of John W. Campbell, Jr.'s "Islands of Space" in "Astounding Science Fiction". The complementary term soft science fiction, formed by analogy to hard science fiction, first appeared in the late 1970s. The term is formed by analogy to the popular distinction between the "hard" (natural) and "soft" (social) sciences. Science fiction critic Gary Westfahl argues that neither term is part of a rigorous taxonomy; instead they are approximate ways of characterizing stories that reviewers and commentators have found useful.    After reading the paragraphs above, we are interested in knowing the entity with which 'leroni of darkover' exhibits the relationship of 'series'. Find the answer from the choices below.  Choices: - 2  - alice  - alien  - all that  - d  - darkover series  - fame  - fantasy  - fiction  - life  - novel  - orbit  - science fiction  - supernatural  - the real world  - universe  - witch world
The answer to this question is:
darkover series