Question: The Foreigner universe is a fictional universe created by an author that has written approximately how many books?

full_context: Document 1: Finisterre universe: The Finisterre universe is a fictional universe created by American science fiction and fantasy author C. J. Cherryh. Currently, it comprises a series of two science fiction / horror novels written by Cherryh, "Rider at the Gate" (1995) and "Cloud's Rider" (1996), also known as The Rider Series. They were published by Warner Books in the US and Hodder & Stoughton in the United Kingdom. The series is about the descendants of lost colonists stranded many generations ago on the hostile planet of Finisterre. For continuity, the two novels should be read in publication sequence.
Document 2: Lois McMaster Bujold: Lois McMaster Bujold ( ; born November 2, 1949) is an American speculative fiction writer. She is one of the most acclaimed writers in her field, having won the Hugo Award for best novel four times, matching Robert A. Heinlein's record, not counting his Retro Hugo. Her novella "The Mountains of Mourning" won both the Hugo Award and Nebula Award. In the fantasy genre, "The Curse of Chalion" won the Mythopoeic Award for Adult Literature and was nominated for the 2002 World Fantasy Award for best novel, and both her fourth Hugo Award and second Nebula Award were for "Paladin of Souls". In 2011 she was awarded the Skylark Award. In 2013 she was awarded the Forry Award. In 2017 she won a Hugo Award for Best Series, for the Vorkosigan Saga.
Document 3: Foreigner universe: The Foreigner universe is a fictional universe created by American writer C. J. Cherryh. The series centers on the descendants of a ship lost in transit from Earth en route to found a new space station. It consists of a series of semi-encapsulated trilogy arcs (or sequences) that focus on the life of Bren Cameron, the human "paidhi", a translator-diplomat to the court of the ruling atevi race. Currently eighteen novels have been published between 1994 and 2017. Cherryh has also self-published two ebook short story prequels to the series, "Deliberations" (October 2012) and "Invitations" (August 2013).
Document 4: Known Space: Known Space is the fictional setting of about a dozen science fiction novels and several collections of short stories written by Larry Niven. It has also become a shared universe in the spin-off "Man-Kzin Wars" anthologies. ISFDB catalogs all works set in the fictional universe that includes Known Space under the series name Tales of Known Space, which was the title of a 1975 collection of Niven's short stories. The first-published work in the series, which was Niven's first published piece was "The Coldest Place", in the December 1964 issue of "If" magazine, edited by Frederik Pohl. This was the first-published work in the 1975 collection.
Document 5: C. J. Cherryh: Carolyn Janice Cherry (born September 1, 1942), better known by the pen name C. J. Cherryh, is an American writer of speculative fiction. She has written more than 60 books since the mid-1970s, including the Hugo Award-winning novels "Downbelow Station" (1981) and "Cyteen" (1988), both set in her Alliance-Union universe. She is known for "world building," depicting fictional realms with great realism supported by vast research in history, language, psychology, and archeology. Her series of fantasy novels set in the Alliance-Union universe, the Morgaine Stories, have sold in excess of 3 million copies.
Document 6: The Gene Wars universe: The Gene Wars universe is a fictional universe developed by science fiction and fantasy author C. J. Cherryh . The universe currently consists of two science fiction novels, "Hammerfall" (2001) and "Forge of Heaven" (2004). The books were published by HarperCollins under the company's "Eos" imprint. "Hammerfall" was nominated for the John W. Campbell Memorial Award in 2002.
Document 7: Susan Allison: Susan Allison is an editor-in-chief and vice president at the Ace Books and Berkley Books imprints, which are part of the Penguin Group (USA) publishing company. In 1984 she published William Gibson’s first novel, Neuromancer, and Guy Gavriel Kay’s first novel, The Summer Tree. Both of these authors are still edited by her, now for Penguin Random House. Her authors also include bestselling author Laurell K. Hamilton and southern eminence Lee Smith. She became editor-in-chief in 1982, and was made a vice-president in 1985. She was a guest of honor of the 1990 World Fantasy Convention.
Document 8: The Cherryh Odyssey: The Cherryh Odyssey is a 2004 collection of essays by various academics, critics and authors about American Hugo Award-winning science fiction and fantasy author, C. J. Cherryh. It was edited by author and academic, Edward Carmien, and was published by Borgo Press, an imprint of Wildside Press as part of its "Author Study" series. "Locus Magazine" put the book on its "2004 Recommended Reading List", and Carmien received a nomination for the 2005 Locus Award for Best Non-fiction book for "The Cherryh Odyssey".
Document 9: Larry Niven: Laurence van Cott Niven ( ; born April 30, 1938) is an American science fiction writer. His best-known work is "Ringworld" (1970), which received Hugo, Locus, Ditmar, and Nebula awards. The Science Fiction and Fantasy Writers of America named him the 2015 recipient of the Damon Knight Memorial Grand Master Award. His work is primarily hard science fiction, using big science concepts and theoretical physics. It also often includes elements of detective fiction and adventure stories. His fantasy includes the series "The Magic Goes Away", rational fantasy dealing with magic as a non-renewable resource.
Document 10: Forester Universe: The Forester Universe is the fictional setting of several novels, novellas, and short stories by Kyell Gold, consisting primarily of homosexual furry romance and erotica. Two of the novels have won the Ursa Major Award for Best Anthropomorphic Novel.
Document 11: Jean M. Auel: Jean Marie Auel ( ; "née" Untinen; born February 18, 1936) is an American writer who wrote the "Earth's Children" books, a series of novels set in prehistoric Europe that explores human activities during this time, and touches on the interactions of Cro-Magnon people with Neanderthals. Her books have sold more than 45 million copies worldwide.
Document 12: Robert Jordan: James Oliver Rigney Jr. (October 17, 1948 – September 16, 2007), better known by his pen name Robert Jordan, was an American author of epic fantasy. He is best known for the "Wheel of Time" series, which comprises 14 books and a prequel novel. He is one of several writers to have written original Conan the Barbarian novels; his are highly acclaimed to this day. Rigney also wrote historical fiction under his pseudonym Reagan O'Neal, a western as Jackson O'Reilly, and dance criticism as Chang Lung. Additionally, he ghostwrote an "international thriller" that is still believed to have been written by someone else.
Document 13: List of prolific writers: Some writers have had prolific careers with hundreds of their works being published. While some best-selling authors have written a small number of books that have sold millions of copies, others have had lengthy careers and maintained a high level of output year after year. Dame Agatha Christie, the most-published novelist in history, is estimated to have sold 4 billion books, having written 69 novels and 19 plays. Her works were published between 1920 and 1976, equating to around three publications every two years. Dame Barbara Cartland has also sold millions of copies of her books but wrote many more than Christie. She spent 80 years as a novelist with 722 books published, averaging one book released every 40 days of her career. While Cartland wrote a significant number of full-length novels, other authors have been published many more times but have specialised in short stories. Spanish author Corín Tellado wrote over 5,000 novellas, selling 400 million copies of her books.
Document 14: Far-Seer: Far-Seer is a novel written by Canadian science fiction author, Robert J. Sawyer. It is the first book of the Quintaglio Ascension Trilogy, and is followed by two sequels: "Fossil Hunter" and "Foreigner". The book depicts an Earth-like world on a moon which orbits a gas giant, inhabited by a species of highly evolved, sentient Tyrannosaurs called Quintaglios, among various other creatures from the late cretaceous period, imported to this moon by aliens 65 million years prior to the story. Originally published in 1992 by Ace Science Fiction, it won the Homer award for "Best Novel" during its initial release date. It was reissued in 2004 by Tor Books.
Document 15: Starship Troupers: Starship Troupers is a science fiction series of novels by American author Christopher Stasheff. It includes three books: "A Company Of Stars", "We Open On Venus" and "A Slight Detour". It also occupies the same continuity as Stasheff's "Warlock of Gramarye" and "Rogue Wizard" series. Set in the 26th Century, after the human race has established colonies on distant planets and interstellar commerce supports Terra (Earth, sometimes known affectionately as "Old Earth") and the Terran Sphere of worlds, the novels follow the establishment and subsequent journeys of "The Star Theater Company", the first-ever interstellar theatre troupe. The series title, "Starship Troupers", was intended as a pun on Robert Heinlein's "Starship Troopers" novel.
ground_truth: 60