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Niven Ring Gravitational Stability Carl A
Niven Ring Gravitational Stability Carl A. Brannen 8500 148th Ave. NE #T-1064, Redmond, WA USA, [email protected] Abstract. A “Niven ring” is a ring of material placed around a star so as to provide a very large inhabitable region. The ring would be solid, about a million miles wide and would be at about earth’s orbit, around 100 million miles from the sun. The ring would be set spinning so that it would provide an equivalent to earth’s gravity field by the action of centrifugal force. Walls a thousand miles high along the edges hold in the atmosphere. The origin of the Niven ring idea is L. Niven’s 1970 novel “Ringworld”. Sometime after writing this book, the author was informed that a Niven ring would be gravitationally unstable. This resulted in further plot development by the author in his 1980 novel, “The Ringworld Engineers”, which describes the efforts necessary to keep the Niven ring orbiting stably. In this short paper we derive the gravitational instability of a Niven ring without calculus. We show that the ring orbit decays exponentially with a time period t of about two months. Keywords: Larry Niven, Ringworld, stability, engineer PACS: 96.15.De, 12.10.Dm 1. INTRODUCTION Larry Niven’s book “Ringworld” [1] describes what is now known as a “Niven ring”, a ring of material surrounding a star at a comfortable (for life) distance, and set in motion so as to provide centrifugal acceleration equivalent to earth’s gravitational field. The orbit of a planet in the gravitational field of the sun is stable, that is, if we make small changes to the orbital parameters this will result in only small changes to the orbit of the planet. -
The Imagined Wests of Kim Stanley Robinson in the "Three Californias" and Mars Trilogies
Portland State University PDXScholar Urban Studies and Planning Faculty Nohad A. Toulan School of Urban Studies and Publications and Presentations Planning Spring 2003 Falling into History: The Imagined Wests of Kim Stanley Robinson in the "Three Californias" and Mars Trilogies Carl Abbott Portland State University, [email protected] Follow this and additional works at: https://pdxscholar.library.pdx.edu/usp_fac Part of the Urban Studies and Planning Commons Let us know how access to this document benefits ou.y Citation Details Abbott, C. Falling into History: The Imagined Wests of Kim Stanley Robinson in the "Three Californias" and Mars Trilogies. The Western Historical Quarterly , Vol. 34, No. 1 (Spring, 2003), pp. 27-47. This Article is brought to you for free and open access. It has been accepted for inclusion in Urban Studies and Planning Faculty Publications and Presentations by an authorized administrator of PDXScholar. Please contact us if we can make this document more accessible: [email protected]. Falling into History: The ImaginedWests of Kim Stanley Robinson in the "Three Californias" and Mars Trilogies Carl Abbott California science fiction writer Kim Stanley Robinson has imagined the future of Southern California in three novels published 1984-1990, and the settle ment of Mars in another trilogy published 1993-1996. In framing these narratives he worked in explicitly historical terms and incorporated themes and issues that characterize the "new western history" of the 1980s and 1990s, thus providing evidence of the resonance of that new historiography. .EDMars is Kim Stanley Robinson's R highly praised science fiction novel published in 1993.1 Its pivotal section carries the title "Falling into History." More than two decades have passed since permanent human settlers arrived on the red planet in 2027, and the growing Martian communities have become too complex to be guided by simple earth-made plans or single individuals. -
New Idea for Dyson Sphere Proposed 30 March 2015, by Bob Yirka
New idea for Dyson sphere proposed 30 March 2015, by Bob Yirka that the massive amount of material needed to build such a sphere would be untenable, thus, a more likely scenario would be a civilization building a ring of energy capturing satellites which could be continually expanded. But the notion of the sphere persists and so some scientists continue to look for one, believing that if such a sphere were built, the process of capturing the energy from the interior sun would cause an unmistakable infrared signature, allowing us to notice its presence. But thus far, no such signatures have been found. That might be because we are alone in the universe, or, as Semiz and O?ur argue, it might be because we are looking at the wrong types of stars. They suggest that it would seem to make more sense for an advanced civilization to build their sphere around a white A Dyson Sphere with 1 AU radius in Sol system. Credit: dwarf, rather than a star that is in its main arXiv:1503.04376 [physics.pop-ph] sequence, such as our sun—not only would the sphere be smaller (they have even calculated an estimate for a sphere just one meter thick—1023 (Phys.org)—A pair of Turkish space scientists with kilograms of matter) but the gravity at its surface Bogazici University has proposed that researchers would be similar to their home planet (assuming it looking for the existence of Dyson spheres might were similar to ours). be looking at the wrong objects. ?brahim Semiz and Salim O?ur have written a paper and uploaded Unfortunately, if Semiz and O?ur are right, we may it to the preprint server arXiv, in which they suggest not be able to prove it for many years, as the that if an advanced civilization were to build a luminosity of a white dwarf is much less than other Dyson sphere, it would make the most sense to stars, making it extremely difficult to determine if build it around a white dwarf. -
Ringworld2-Manual
RINGWORLD: Revenge of the Patriarch'M RINGWORLD AND KNOWN SPACE CREATED BY Larry Niven GAME DESIGN TsAGE DEVELOPED BY John Jarrett Robert E. Heitman Chris Hoyt Eric Hart Robert E. Heitman John Rettig Chris Hoyt GAME PROGRAMMING John Crane Chris Hoyt John Hamilton with Robert E. Heitman TsAGE MUSIC SYSTEM Nancy Churchill Eric Hart PRE-PRODUCTION DESIGN & QUALITY ASSURANCE ART DIRECTION Sol Ackerman Douglas Herring Becky Jarrett Bryan Ackerman ANIMATION Monica Longaker Deena Krutak Gary Cox COVER ILLUSTRATION Les White John Shaw BACKGROUNDS PACKAGE AND USER'S MANUAL Jane Cardinal DESIGN AND LAYOUT Peter Ledger Greg Steffen Susan Wilson Steffen Design Group with Gary Cox USER'S MANUAL John Shaw John Jarrett Les White Robert E. Heitman Deena Krutak TALKER ANIMATION Deena Krutak with RINGWORLD and all prominent characters and Gary Cox elements contained therein are trademarks of Les White New Frontier Entertainment. Q New Frontier Entertainment, 1992 MUSICAL SCORE RI NGWORLD: Revenge of the Patriarch'"' TM designates trademark of Tsunami Media, Inc. AND SOUND EFFECTS Q Tsunami Media, Inc., 1992. All rights reserved. Ken Allen Printed in the U.S.A. OBRHGE BLUE GBEEH YHLOllJ BED YELLOllJ BED BLUE GBEEH OBRHGE RINGWORLD: REVENGE OF THE PATRIARCH IS AN THIS SECTION OF THE MANUAL CONTAINS INSTRUCTIONS WELCOME interactive story game set in the realm of Known Space on how to install the game and begin play. GffilNG created by best-selling author Larry Niven. This manual STARTED is your guide and contains vital specifications on how to Minimum System Needed IBM or 100% compatible repair your hyperspace control circuits. It also contains 386SX 16 Mhz or faster processor helpful information on installing, playing, and enjoying MS-DOS Version 5.0 or greater Ringworld, so we suggest that you read the entire manual 640Kb memory with 590,000 bytes available as you are installing the program. -
Pyramid Volume 3 in These Issues (A Compilation of Tables of Contents and in This Issue Sections) Contents Name # Month Tools Of
Pyramid Volume 3 In These Issues (A compilation of tables of contents and In This Issue sections) Contents Name # Month Name # Month Tools of the Trade: Wizards 1 2008-11 Noir 42 2012-04 Looks Like a Job for… Superheroes 2 2008-12 Thaumatology III 43 2012-05 Venturing into the Badlands: Post- Alternate GURPS II 44 2012-06 3 2009-01 Apocalypse Monsters 45 2012-07 Magic on the Battlefield 4 2009-02 Weird Science 46 2012-08 Horror & Spies 5 2009-03 The Rogue's Life 47 2012-09 Space Colony Alpha 6 2009-04 Secret Magic 48 2012-10 Urban Fantasy [I] 7 2009-05 World-Hopping 49 2012-11 Cliffhangers 8 2009-06 Dungeon Fantasy II 50 2012-12 Space Opera 9 2009-07 Tech and Toys III 51 2013-01 Crime and Grime 10 2009-08 Low-Tech II 52 2013-02 Cinematic Locations 11 2009-09 Action [I] 53 2013-03 Tech and Toys [I] 12 2009-10 Social Engineering 54 2013-04 Thaumatology [I] 13 2009-11 Military Sci-Fi 55 2013-05 Martial Arts 14 2009-12 Prehistory 56 2013-06 Transhuman Space [I] 15 2010-01 Gunplay 57 2013-07 Historical Exploration 16 2010-02 Urban Fantasy II 58 2013-08 Modern Exploration 17 2010-03 Conspiracies 59 2013-09 Space Exploration 18 2010-04 Dungeon Fantasy III 60 2013-10 Tools of the Trade: Clerics 19 2010-05 Way of the Warrior 61 2013-11 Infinite Worlds [I] 20 2010-06 Transhuman Space II 62 2013-12 Cyberpunk 21 2010-07 Infinite Worlds II 63 2014-01 Banestorm 22 2010-08 Pirates and Swashbucklers 64 2014-02 Action Adventures 23 2010-09 Alternate GURPS III 65 2014-03 Bio-Tech 24 2010-10 The Laws of Magic 66 2014-04 Epic Magic 25 2010-11 Tools of the -
Astronomy 330 Classes Final Papers Final
Astronomy 330 Classes •! CHP allows $100 for informal get togethers. •! We are meeting Thursday to watch a movie and order some pizza. •! Still want Armageddon? Music: Space Race is Over – Billy Bragg Final Papers Final •! Final papers due on May 3rd. •! Take-home final –! At the beginning of class... •! Will email it out on the last class. •! You must turn final paper in with the graded •! Will consist of: rough draft. –! 2 large essays •! If you are happy with your rough draft grade as –! 2 short essays you final paper grade, then don’t worry about it. –! 5-8 short answers •! Due May 11th, hardcopy, by 5pm in my mailbox or office. Online ICES Outline •! What is the future for interstellar travel? •! ICES forms are available online. •! Fermi’s Paradox– Where are they? •! I appreciate you filling them out! –! In addition to campus honors thingy •! Please make sure to leave written comments. I find these comments the most useful, and typically that’s where I make the most changes to the course. Drake Equation Warp Drives Frank That’s 22,181 advanced civs!!! Drake •! Again, science fiction is influencing science. •! Due to great distance between the stars and the speed limit of c, sci-fi had to resort to “Warp Drive” that allows faster-than-light speeds. N = R* ! fp ! ne ! fl ! fi ! fc ! L •! Currently, this is impossible. # of # of •! It is speculation that requires a Star Fraction Fraction advanced Earthlike Fraction Fraction Lifetime of formation of stars that revolution in physics civilizations planets on which that evolve advanced rate with commun- we can per life arises intelligence civilizations –! It is science fiction! planets icate contact in system •! But, we have been surprised our Galaxy 6 before… today 15 0.65 1.3 x 0.1 0.125 0.175 .8 1x10 •! Unfortunately new physics usually = 0.13 intel./ comm./ yrs/ http://www.filmjerk.com/images/warp.gif stars/ systems/ life/ adds constraints not removes them. -
Location: NT-13 “Lamprey” Dyson Sphere Station (Incomplete), Edge of Terran Protectorate Shift Timestamp: 01:58 February, 30
Location: NT-13 “Lamprey” Dyson Sphere Station (Incomplete), Edge of Terran Protectorate Shift Timestamp: 01:58 February, 30, 2560 ‘The amazing part is,’ a voice in my head spoke up as I slipped through yet another set of maintenance shafts and corridors that looked exactly the same as the last ones I’d just ducked out of, ‘the whole power grid is still working.’ I nodded at that, and got back to work slapping wall mounted Security flashers onto the walls, outright using some Clown’s SUPER Glue to get the job done in as short a time as I could. It didn’t stop the robots from using the damn places, but at least it kept the more biological threats from trying their hands at rooting me out personally. Waking up in this life had been not good. … Azure ‘starlight’ seeps like syrup though cracks in the glass ceiling, through which a massive sapphire blue ‘star’ could easily be observed from the viens the station that were the maintenance halls. The floor shudders in time with the churning of machinery somewhere far beneath my feet. The air, if I were to pull off my hermetically sealed helmet off for a moment, has the strange tang of unknown chemicals and over-processed air that speaks of any space station, but the undertones of copper and something wholly unpleasant, something like rot and excrement and worse, are unique to this place. I stopped as a door opened in the distance and without even thinking I unholstered the gun from my chest sling. -
Fafnir – Nordic Journal of Science Fiction and Fantasy Research Journal.Finfar.Org
ISSN: 2342-2009 Fafnir vol 3, iss 4, pages 7–227–23 Fafnir – Nordic Journal of Science Fiction and Fantasy Research journal.finfar.org Speculative Architectures in Comics Francesco-Alessio Ursini Abstract: The present article offers an analysis on how comics authors can employ architecture as a narrative trope, by focusing on the works of Tsutomu Nihei (Blame!, Sidonia no Kishi), and the duo of Francois Schuiten and Benoit Peeters (Le cités obscures). The article investigates how these authors use architectural tropes to create speculative fictions that develop renditions of cities as complex narrative environments, and “places” with a distinctive role and profile in stories. It is argued that these authors exploit the multimodal nature of comics and the potential of architecture to construct complex worlds and narrative structures. Keywords: architectural tropes, comics, narrative structure, speculative fiction, world-building, multimodality Biography and contact info: Francesco-Alessio Ursini is currently a lecturer in English linguistics and literature at Jönköping University. His works on comics include a special issue on Grant Morrison for the journal ImageTexT, and the forthcoming Visions of the Future in Comics (McFarland Press), both co-edited with Frank Bramlett and Adnan Mahmutović. Speculative fiction and comics have always been tightly connected across different cultural traditions. It has been argued that the “golden era” of manga (Japanese comics) in the 70’s and 80’s is based on the preponderance of works using science/speculative fiction settings (e.g. Akira, Ohsawa 9–26). Similarly, classic works in the “Latin” comic traditions (i.e. Latin American historietas, Italian fumetti, and French/Belgian bande desineés) have long represented an ideal nexus between the speculative fiction genre and the Comics medium, one example being El Eternauta (Page 46–50). -
Dyson Spheres Around White Dwarfs Arxiv:1503.04376V1 [Physics.Pop-Ph] 15 Mar 2015
Dyson Spheres around White Dwarfs Ibrahim_ Semiz∗ and Salim O˘gury Bo˘gazi¸ciUniversity, Department of Physics Bebek, Istanbul,_ TURKEY Abstract A Dyson Sphere is a hypothetical structure that an advanced civ- ilization might build around a star to intercept all of the star's light for its energy needs. One usually thinks of it as a spherical shell about one astronomical unit (AU) in radius, and surrounding a more or less Sun-like star; and might be detectable as an infrared point source. We point out that Dyson Spheres could also be built around white dwarfs. This type would avoid the need for artificial gravity technol- ogy, in contrast to the AU-scale Dyson Spheres. In fact, we show that parameters can be found to build Dyson Spheres suitable {temperature- and gravity-wise{ for human habitation. This type would be much harder to detect. 1 Introduction The "Dyson Sphere" [1] concept is well-known in discussions of possible in- telligent life in the universe, and has even infiltrated popular culture to some extent, including being prominently featured in a Star Trek episode [2]. In its simplest version, it is a spherical shell that totally surrounds a star to intercept all of the star's light. If a Dyson Sphere (from here on, sometimes \Sphere", sometimes DS) was built around the Sun, e.g. with same radius (1 AU) as Earth's orbit (Fig. 1), it would receive all the power of the Sun, 3:8 × 1026 W, in contrast to the power intercepted by Earth, 1:7 × 1017 W. -
Ringworld 01 Ringworld Larry Niven CHAPTER 1 Louis Wu
Ringworld 01 Ringworld Larry Niven CHAPTER 1 Louis Wu In the nighttime heart of Beirut, in one of a row of general-address transfer booths, Louis Wu flicked into reality. His foot-length queue was as white and shiny as artificial snow. His skin and depilated scalp were chrome yellow; the irises of his eyes were gold; his robe was royal blue with a golden steroptic dragon superimposed. In the instant he appeared, he was smiling widely, showing pearly, perfect, perfectly standard teeth. Smiling and waving. But the smile was already fading, and in a moment it was gone, and the sag of his face was like a rubber mask melting. Louis Wu showed his age. For a few moments, he watched Beirut stream past him: the people flickering into the booths from unknown places; the crowds flowing past him on foot, now that the slidewalks had been turned off for the night. Then the clocks began to strike twenty-three. Louis Wu straightened his shoulders and stepped out to join the world. In Resht, where his party was still going full blast, it was already the morning after his birthday. Here in Beirut it was an hour earlier. In a balmy outdoor restaurant Louis bought rounds of raki and encouraged the singing of songs in Arabic and Interworld. He left before midnight for Budapest. Had they realized yet that he had walked out on his own party? They would assume that a woman had gone with him, that he would be back in a couple of hours. But Louis Wu had gone alone, jumping ahead of the midnight line, hotly pursued by the new day. -
Transhumanity's Fate
ECLIPSE PHASE: TRANSHUMANITY’S FATE The Fate Conversion Guide for Eclipse Phase RYAN JACK MACKLIN GRAHAM ECLIPSE PHASE: TRANSHUMANITY’S FATE Transhumanity’s Fate: ■ Brings technothriller espionage and horror in a world of upgraded humans to Fate Core. ■ Join Firewall, and defend transhumanity in the aftermath of near annihilation by arti cial intelligence. ■ Requires Fate Core to play. Eclipse Phase created by Posthuman Studios Eclipse Phase is a trademark of Posthuman Studios LLC. Transhumanity’s Fate is © 2016. Some content licensed under a Creative Commons License. Fate™ is a trademark of Evil Hat Productions, LLC. The Powered by Fate logo is © Evil Hat Productions, LLC and is used with permission. eclipsephase.com TRANSHUMANITY'S FATE WRITING DEDICATION Jack Graham, Ryan Macklin The Posthumans dedicate this book to Jef Smith, our ADDITIONAL MATERIAL companion of many days & nights around the table. Jef was a tireless organizer in Chicago's science-fiction/ Rob Boyle, Caleb Stokes fantasy fandom, including the Think Galactic reading EDITING group and spin-off convention, Think Galacticon. In Rob Boyle, Jack Graham 2015, he co-published the Sisters of the Revolution: A GRAPHIC DESIGN Feminist Speculative Fiction Anthology with PM Press. Adam Jury We will miss Jef's encouragement, wit, and bottomless COVER ART generosity. The person who lives large in the lives of their friends is not soon forgotten. Stephan Martiniere A portion of profits from Transhumanity's Fate will be INTERIOR ART donated to Jef's family. Rich Anderson, Nic Boone, Leanne Buckley, Anna Christenson, Daniel Clarke, Paul Davies, SPECIAL THANKS Alex Drummond, Danijel Firak, Nathan Geppert, Ryan thanks his wife, Lillian, for her support and Zachary Graves, Tariq Hassan, Josu Hernaiz, octomorph shenanigans, and blackcoat for being a font Jason Juta, Sergey Kondratovich, Ian Llanas, of feedback. -
The Hugo Awards for Best Novel Jon D
The Hugo Awards for Best Novel Jon D. Swartz Game Design 2013 Officers George Phillies PRESIDENT David Speakman Kaymar Award Ruth Davidson DIRECTORATE Denny Davis Sarah E Harder Ruth Davidson N3F Bookworms Holly Wilson Heath Row Jon D. Swartz N’APA George Phillies Jean Lamb TREASURER William Center HISTORIAN Jon D Swartz SECRETARY Ruth Davidson (acting) Neffy Awards David Speakman ACTIVITY BUREAUS Artists Bureau Round Robins Sarah Harder Patricia King Birthday Cards Short Story Contest R-Laurraine Tutihasi Jefferson Swycaffer Con Coordinator Welcommittee Heath Row Heath Row David Speakman Initial distribution free to members of BayCon 31 and the National Fantasy Fan Federation. Text © 2012 by Jon D. Swartz; cover art © 2012 by Sarah Lynn Griffith; publication designed and edited by David Speakman. A somewhat different version of this appeared in the fanzine, Ultraverse, also by Jon D. Swartz. This non-commercial Fandbook is published through volunteer effort of the National Fantasy Fan Federation’s Editoral Cabal’s Special Publication committee. The National Fantasy Fan Federation First Edition: July 2013 Page 2 Fandbook No. 6: The Hugo Awards for Best Novel by Jon D. Swartz The Hugo Awards originally were called the Science Fiction Achievement Awards and first were given out at Philcon II, the World Science Fiction Con- vention of 1953, held in Philadelphia, Pennsylvania. The second oldest--and most prestigious--awards in the field, they quickly were nicknamed the Hugos (officially since 1958), in honor of Hugo Gernsback (1884 -1967), founder of Amazing Stories, the first professional magazine devoted entirely to science fiction. No awards were given in 1954 at the World Science Fiction Con in San Francisco, but they were restored in 1955 at the Clevention (in Cleveland) and included six categories: novel, novelette, short story, magazine, artist, and fan magazine.