The Planetary Report (ISSN 0736-3680) Is Published Six Times Yearly at View of Our Second Decade

Total Page:16

File Type:pdf, Size:1020Kb

The Planetary Report (ISSN 0736-3680) Is Published Six Times Yearly at View of Our Second Decade A Publication 01 THEPLANE~ SOCIETY o o o o o • 0-e Board of Directors FROIVI THE CARL SAGAN BRUC E MURRAY EDITOR President Vice President Director. Laboratory for Planetary Professor of Planetary Studies, Cornell University Science, California Institute of Technology LOUIS FRIEDMAN Executive Director JOSEPH RYAN O'Melveny & Myers MICHAEL COLLINS Apollo 11 astronaut STEVEN SPIELBERG director and producer THOMAS O. PAINE former Administrator. NASA HENRY J. TANNER ith this issue of The Planetary Re­ The Planetary Society is, first and fore­ Chairman, National financial consultant Commis$ion on Space Wport we mark the 10th anniversary most, a membership organization. Here Board of Advisors of The Planetary Society. I've heard it are some longtime members' views of DIANE ACKERMAN JOHN M. LOGSDON said that nobody cares about organiza­ The Society, its past and future. poet and author Director. Space Policy Institute, George Washington University tions' anniversaries, except their staffs Page 14-Asteroids in Your Future­ ISAAC ASIMOV author HANS MARK and boards. Still, every year, groups The three best known candidate asteroids Chancel/or, RICHARD BERENDZEN Universify of Texas System for spacecraft missions have all been dis­ educator and astrophysicist around the world celebrate their own exis­ JAMES MICHENER tences. covered by Eleanor Helin and her team. JACOUES BLAMONT author Chief Scientist, Centre National d'Etudes Spatiafes. MARVIN MINSKY We considered that opinion carefully The Planetary Society continues to sup­ France Toshiba Professor of Media Arts and Sciences, Massachusetts and agreed that most anniversaries are port this productive project. RAY BRADBURY Institute of Technology poet and author simply glorifications of the past and can Page 16-Glimpses of a Goddess-Al­ ARTHUR C. CLARKE PHI LIP MORRISON fnstitute Professor. Massachusetts be pointless exercises in self-congratula­ though attention is now focused on Mag­ author fnstitute of Technology CORNELIS DE JAGER tion. But The Planetary Society is an or­ ellan as it begins its Venus mission, Earth­ Professor of Space Research. PAUL NEWMAN The Astronomica/ lnstitute at actor ganization that, in its very being, looks to based radar is still teaching us much about Utrecht, The Netherlands JUN NISHIMU RA the future. And that vision is one of the this neighboring world. FRANK DRAKE Direc/or-Generaf, Institute of Space Professor of Astronomy and and Astronautical Sciences. Japan grandest imaginable: We seek to make Page 19-5ister Worlds: Earth and Astrophysics, University of California at Santa Cruz BERNARD M. OLIVER Chief, SETI Program. possible a human future among the plan­ Venus-The Society has mounted an am­ LEE A. DUBRIDGE NASA/Ames Research Center former presidential ets and to answer an age-old question: Is bitious program to show how studies of science advisor SALLY RIDE Director, California Space InstilUle. human civilization alone in the universe? Earth's sister world have taught us much JOHN GARDNER Unwersity of California. San Diego founder. Common Cause and former astronaut So to mark our first decade, we have about our home planet. MARC GARNEAU ROALD Z. SAGDEEV chosen not to parade the Society'S accom­ Page 20-Seeding the Future-It is the Canadian astronaut former Director. Institute for Space Research. plishments before you or to recount a Society'S policy to seek out small projects GEORGIY GOLITSYN Academy of Sciences of the USSR Institute of Atmospheric Physics, Academy of Sciences of the USSR HARRISON H. SCHMITT history we share. Instead, we will look to­ where a little bit of "seed" money can former US Senator, NM THEODORE M. HESBURGH and Apollo 17 astronaut ward our next 10 years, drawing on our blossom into products and programs that President Emeritus, University of Notre Dame S. ROSS TAYLOR past experiences to set guideposts for 10 can shape the future. SH IRLEY M. HUFSTEDLER Professorial Fello w, Australian Page 22-Students: Help Send Us To­ educator and jurisl National Universify, Canberra more years of achievement. GARRY E. HUNT LEWIS THOMAS Page 3-The Next 10 Years-The Plan­ gether to Mars-The H. Dudley Wright space scientist. Chancellor; Memorial Sloan United Kingdom Kettering Cancer Center etary Society was born in 1980 from the International Student Contest, "Together SERG EI KAPITSA JAMES VAN ALLEN vision of Carl Sagan, Bruce Murray and to Mars," is designed to inspire the plane­ Institute for Physical Problems, Professor of Physics, Academy of Sciences of the USSR University of Iowa Louis Friedman. Here they give us their tary scientists and engineers of tomorrow. The Planetary Report (ISSN 0736-3680) is published six times yearly at view of our second decade. Page 23-The Volunteer Network-A the editorial offices of The Planetary Society, 65 North Catalina Avenue, Pasadena. CA 9 11 06. (818) 793-5100. It is available to members of The Page 6-A Decade of SETI-In the crucial network of dedicated volunteers Planetary Society. Annual dues in the US or Canada are $25 US doliars or $30 Canadian. Dues outside the US or Canada are $30 (US). Search for Extraterrestrial Intelligence the links Society members around the world. Editor, CHARLENE M. ANDERSON Society has made a truly significant con­ Page 24-World Watch-Planetary ex­ Technical Editor, JAMES D. BURKE Assistant Editor, DONNA ESCANDON STEVENS tribution. We sponsor the most powerful ploration and SETI face a political crisis. Copy Editor, MARY ELIZABETH WILLIAMS Page 26-News & Reviews-Clark Art Director, BARBARA SMITH continuous program on Earth today. Viewpoints expressed in columns or editorials are those of the authors and Page 8-The 1990s: A New Decade of Chapman has contributed to every issue do not necessarily represent positions 01 The Planetary Society, its officers or advisors. © 1990 by The Planetary Society. Discovery?-Throughout the 1980s our of The Planetary Report. In this column, In Canada. Second Class Mail Registration Number 9567 Boards of Directors and Advisors have he ponders the future of planetary science. Page 27-Society Notes-We announce COVER: A Voyager 1 portrait of Saturn appeared on been great sources of inspiration and help. the cover of the first Planetary Report. Ten years later, Here they share their visions of the 1990s. grants, fellowships, scholarships and a we print a recently created computer-mosaic of images Page 10-Flying Snakes on Mars-The new consultant in Washington, DC. captured by Voyager 2. These colors were generated by combining images taken through the blue, green Planetary Society is the first private orga­ Page 28-Q & A-Our most popular and ultraviolet filters on Voyager's camera, giving this nization to be an official member of a column returns with Titan's atmosphere, image a slightly purplish tint. Four satellites appear planetary mission. This is the story of our lo's volcanoes and threatening asteroids. with their parent planet; from left to right, Mimas and its shadow on Saturn, Tethys and its shadow, Dione SNAKE guide-rope for the Mars Balloon Page 31-An Invitation to All and Rhea. portion of the Soviets' Mars '94 mission. Members-Help us celebrate our an­ Image enhanced by Alfred S. McEwen and Tammy L. Becker, United States Geological Survey Page 12-0ur Members Remember- niversary.-Charlene M. Anderson The Planetary Societys Officers Look to its Future by Carl Sagan, Bruce Murray and louis D. Friedman ophecy is a lost art. We cannot pretend to know anniversary year, on what the organization can the future of our society or the future of the achieve in the next 10 years-not so much to predict, world's space program. Historically, estimates but to set guideposts for our activities. We are proud of what we will achieve in technology in the next few of our first decade. When we founded the Society, we years tend to be too optimistic and, in the next few imagined neither our phenomenal growth nor the decades, too pessimistic-the latter generally because wide range of our present undertakings. we cannot foresee major new scientific discoveries or Our first hope for the next 10 years might be for technological innovations. And, it is clear from recent success in one of our fundamental reasons for being: headlines, the world is changing fast-politically, the search for extraterrestrial life. Whether it were the economically and socially. Those changes clearly will discovery of a microfossil on Mars (unlikely in the affect the human future in space. next decade), the signature of proteins or nucleic At The Planetary Society we are focusing, in this acids on Jupiter or on a comet or in interstellar space, ~ RIGHT: Perhaps never before or since have the American people felt so much pride as when Neil Armstrong and Buzz Aldrin set foot on the Moon. Indeed, al/ the peoples of Earth shared in their achievement. Such triumphs are or the detection of a radio signal from an still possible; there are other worlds where humans can alien civilization, that would surely be one walk. If the space faring nations of Earth work together, we of the most important scientific discover­ may someday see humans land on asterOids, Mars and ies in human history. perhaps other worlds. The Planetary Society would be very Photograph: /',lei! Armstrong, courtesy Johnson Space Center, NASA lucky to playa role in such a discovery, BELOW: The Soviet people have felt immense pride in but we are trying to make our own luck. their space program, often according heroic status to their For the foreseeable future, our organiza­ cosmonauts. Here a glorified cosmonaut spreads his arms over a church, representing the Russian past, and a crowd tion will be conducting the only serious of people celebrating their present and future achieve­ search for extraterrestrial life. With META ments in space. II soon to come "on-line" in Argentina Painting: Yuri Tsirkunov, from In the Stream of Stars (see pages 6-7), we will be searching for radio signals from the entire sky, from both celestial hemispheres.
Recommended publications
  • COURT of CLAIMS of THE
    REPORTS OF Cases Argued and Determined IN THE COURT of CLAIMS OF THE STATE OF ILLINOIS VOLUME 39 Containing cases in which opinions were filed and orders of dismissal entered, without opinion for: Fiscal Year 1987 - July 1, 1986-June 30, 1987 SPRINGFIELD, ILLINOIS 1988 (Printed by authority of the State of Illinois) (65655--300-7/88) PREFACE The opinions of the Court of Claims reported herein are published by authority of the provisions of Section 18 of the Court of Claims Act, Ill. Rev. Stat. 1987, ch. 37, par. 439.1 et seq. The Court of Claims has exclusive jurisdiction to hear and determine the following matters: (a) all claims against the State of Illinois founded upon any law of the State, or upon an regulation thereunder by an executive or administrative ofgcer or agency, other than claims arising under the Workers’ Compensation Act or the Workers’ Occupational Diseases Act, or claims for certain expenses in civil litigation, (b) all claims against the State founded upon any contract entered into with the State, (c) all claims against the State for time unjustly served in prisons of this State where the persons imprisoned shall receive a pardon from the Governor stating that such pardon is issued on the grounds of innocence of the crime for which they were imprisoned, (d) all claims against the State in cases sounding in tort, (e) all claims for recoupment made by the State against any Claimant, (f) certain claims to compel replacement of a lost or destroyed State warrant, (g) certain claims based on torts by escaped inmates of State institutions, (h) certain representation and indemnification cases, (i) all claims pursuant to the Law Enforcement Officers, Civil Defense Workers, Civil Air Patrol Members, Paramedics and Firemen Compensation Act, (j) all claims pursuant to the Illinois National Guardsman’s and Naval Militiaman’s Compensation Act, and (k) all claims pursuant to the Crime Victims Compensation Act.
    [Show full text]
  • SFSC Search Down to 4
    C M Y K www.newssun.com EWS UN NHighlands County’s Hometown-S Newspaper Since 1927 Rivalry rout Deadly wreck in Polk Harris leads Lake 20-year-old woman from Lake Placid to shutout of AP Placid killed in Polk crash SPORTS, B1 PAGE A2 PAGE B14 Friday-Saturday, March 22-23, 2013 www.newssun.com Volume 94/Number 35 | 50 cents Forecast Fire destroys Partly sunny and portable at Fred pleasant High Low Wild Elementary Fire alarms “Myself, Mr. (Wally) 81 62 Cox and other administra- Complete Forecast went off at 2:40 tors were all called about PAGE A14 a.m. Wednesday 3 a.m.,” Waldron said Wednesday morning. Online By SAMANTHA GHOLAR Upon Waldron’s arrival, [email protected] the Sebring Fire SEBRING — Department along with Investigations into a fire DeSoto City Fire early Wednesday morning Department, West Sebring on the Fred Wild Volunteer Fire Department Question: Do you Elementary School cam- and Sebring Police pus are under way. Department were all on think the U.S. govern- The school’s fire alarms the scene. ment would ever News-Sun photo by KATARA SIMMONS Rhoda Ross reads to youngsters Linda Saraniti (from left), Chyanne Carroll and Camdon began going off at approx- State Fire Marshal seize money from pri- Carroll on Wednesday afternoon at the Lake Placid Public Library. Ross was reading from imately 2:40 a.m. and con- investigator Raymond vate bank accounts a children’s book she wrote and illustrated called ‘A Wildflower for all Seasons.’ tinued until about 3 a.m., Miles Davis was on the like is being consid- according to FWE scene for a large part of ered in Cyprus? Principal Laura Waldron.
    [Show full text]
  • Board Certified Fellows
    AMERICAN BOARD OF MEDICOLEGAL DEATH INVESTIGATORS Certificant Directory As of September 30, 2021 BOARD CERTIFIED FELLOWS Addison, Krysten Leigh (Inactive) BC2286 Allmon, James L. BC855 Travis County Medical Examiner's Office Sangamon County Coroner's Office 1213 Sabine Street 200 South 9th, Room 203 PO Box 1748 Springfield, IL 62701 Austin, TX 78767 Amini, Navid BC2281 Appleberry, Sherronda BC1721 Olmsted Medical Examiner's Office Adams and Broomfield County Office of the Coroner 200 1st Street Southwest 330 North 19th Avenue Rochester, MN 55905 Brighton, CO 80601 Applegate, MD, David T. BC1829 Archer, Meredith D. BC1036 Union County Coroner's Office Mohave County Medical Examiner 128 South Main Street 1145 Aviation Drive Unit A Marysville, OH 43040 Lake Havasu, AZ 86404 Bailey, Ted E. (Inactive) BC229 Bailey, Sanisha Renee BC1754 Gwinnett County Medical Examiner's Office Virginia Office of the Chief Medical Examiner 320 Hurricane Shoals Road, NE Central District Lawrenceville, GA 30046 400 East Jackson Street Richmond, VA 23219 Balacki, Alexander J BC1513 Banks, Elsie-Kay BC3039 Montgomery County Coroner's Office Maine Office of the Chief Medical Examiner 1430 Dekalb Street 30 Hospital Street PO Box 311 Augusta, ME 04333 Norristown, PA 19404 Bautista, Ian BC2185 Bayer, Lindsey A. BC875 New York City Office of Chief Medical Examiner District 5 and 24 Medical Examiner Office 421 East 26th Street 809 Pine Street New York, NY 10016 Leesburg, FL 34756 Beck, Shari L BC327 Beckham, Phinon Phillips BC2305 Sedgwick Co Reg. Forensic Science Center Virginia Office of the Chief Medical Examiner 1109 N. Minneapolis Northern District Wichita, KS 67214 10850 Pyramid Place, Suite 121 Manassas, VA 20110 Bednar Keefe, Gale M.
    [Show full text]
  • Summary of Sexual Abuse Claims in Chapter 11 Cases of Boy Scouts of America
    Summary of Sexual Abuse Claims in Chapter 11 Cases of Boy Scouts of America There are approximately 101,135sexual abuse claims filed. Of those claims, the Tort Claimants’ Committee estimates that there are approximately 83,807 unique claims if the amended and superseded and multiple claims filed on account of the same survivor are removed. The summary of sexual abuse claims below uses the set of 83,807 of claim for purposes of claims summary below.1 The Tort Claimants’ Committee has broken down the sexual abuse claims in various categories for the purpose of disclosing where and when the sexual abuse claims arose and the identity of certain of the parties that are implicated in the alleged sexual abuse. Attached hereto as Exhibit 1 is a chart that shows the sexual abuse claims broken down by the year in which they first arose. Please note that there approximately 10,500 claims did not provide a date for when the sexual abuse occurred. As a result, those claims have not been assigned a year in which the abuse first arose. Attached hereto as Exhibit 2 is a chart that shows the claims broken down by the state or jurisdiction in which they arose. Please note there are approximately 7,186 claims that did not provide a location of abuse. Those claims are reflected by YY or ZZ in the codes used to identify the applicable state or jurisdiction. Those claims have not been assigned a state or other jurisdiction. Attached hereto as Exhibit 3 is a chart that shows the claims broken down by the Local Council implicated in the sexual abuse.
    [Show full text]
  • COURT of CLAIMS of THE
    REPORTS ,I OF Cases Argued and Determined IN THE COURT of CLAIMS OF THE STATE OF ILLINOIS . VOLUME 44 Containing cases in which opinions were filed and orders of dismissal entered, without opinion for: Fiscal Year 1992 - July 1, 1991- June 30, 1992 SPRINGFIELD, ILLINOIS 1-993 (Printed by authority of the State of Illinois) (X24064-300-7/93) PREFACE The opinions of the Court of Claims reported herein are published by authority of the provisions of Section 18 of the Court of Claims Act, 705 ILCS 505/1 et seq., formerly 111. Rev. Stat. 1991, ch. 37, par. 439.1 et seq. The Court of Claims has exclusive jurisdiction to hear and determine the following matters: (a) all claims against the State of Illinois founded upon any law of the State, or upon any regulation thereunder by an executive or administrative officer or agency, other than claims arising under the Workers’ Compensation Act or the Workers’ Occupational Diseases Act, or claims for certain expenses in civil litigation, (b) all claims against the State founded upon any contract entered into with the State, (c) all claims against the State for time unjustly served in prisons of this State where the persons imprisoned shall receive a pardon from the Governor stating that such pardon is issued on the grounds of innocence of the crime for which they were imprisoned, (d) all claims against the State in cases sounding in tort, (e) all claims for recoupment made by the State against any Claimant, (f) certain claims to compel replacement of a lost or destroyed State warrant, (g) certain claims based on torts by escaped inmates of State institutions, (h) certain representation and indemnification cases, (i) all claims pursuant to the Law Enforcement Officers, Civil Defense Workers, Civil Air Patrol Members, Paramedics, Firemen & State Employees Compensation Act, (j) all claims pursuant to the Illinois National Guardsman’s Compensation Act, and (k) all claims pursuant to the Crime Victims Compen- sation Act.
    [Show full text]
  • The American Nations; Or, Outlines of Their General History, Ancient And
    DUMBER 1. SPRIIVO 1836. THE AMERICAN NATIONS; OR, Outlines of A National History; OF THE ANCIENT AND MODERN NATIONS OF NORTH AND SOUTH AMERICA. yx* 4* Of this wide Western Hemisphera^\) Let us retrace the TT history ; * J **/yj ^/ Of all the Nations -L-*-* "* ^ * dwelling herejj^herejk f/* Let us recall the memory ^SSv C\* ^*^^>-^ * O*illf ts ; T^rsss- - ---^ FIRST NUMBER, OR VOMJME: GENERALITIES AND ANNALS. BY PROF. C. S* RAFINESQUE, PHILADEI.PHIA, PUBLISHED BY C. S. RAFINESQUE, NO. 110 NORTH TENTH STREET, SOLD BY THE PRINCIPAL BOOKSELLERS, AND IN LONDON BY O. RICH, IN PARIS BY MEILHAC & BAILLERE. 183G PROSPECTUS. Published quarterly at Five Dollars in advance for Six Numbers or Volumes, simi lar to this, of nearly 300 pages each sep arate Number sold for one Dollar, or more when they will contain maps and illustra tions. A list of Agents will be given hereafter. At present the principal Booksellers may act as such. The Names ot the Subscribers will be printed in a subsequent Number. It is contemplated to conclude these an nals and their illustrations in 12 Numbers or Volumes. Therefore the whole cost to subscribers will only be f 10, for which a complete American Historical Library will be obtained. By remitting $5 to the author, six Vol umes are secured whatever be their future price, and will be sent by mail: a similar sum will be due when the 7th number is issued. Those who may prefer to pay $10 at once, will be deemed Patrons of the work. Whoever subscribes and pays for 5 sets, is entitled to a 6th gratis.
    [Show full text]
  • Walter S. Kiefer
    Walter S. Kiefer Lunar and Planetary Institute (281) 486-2110 (Office) 3600 Bay Area Blvd. [email protected] Houston, TX 77058 https://www.lpi.usra.edu/science/staff/kiefer/ Education Ph.D., Planetary Science and Geophysics, California Institute of Technology, 1990 Thesis: Models for the Formation of Highland Regions on Venus M.S., Planetary Science, California Institute of Technology, 1986 B.S., Physics and Astronomy, Texas Christian University, 1984, summa cum laude Honors Thesis: Fourier Transform Infrared Spectroscopy of Clay Minerals and Tar Sands Professional Experience Lunar and Planetary Institute, 1993-present Senior Staff Scientist, 2017-present Manager for Geophysics and Small Bodies Group, 2019-present Staff Scientist, 1997-2016 Research Scientist, 1993-1997 National Research Council Research Associate, Goddard Space Flight Center, 1990-1993 Graduate Research Assistant and Graduate Teaching Assistant, Division of Geological and Planetary Sciences, California Institute of Technology, 1984-1990 Spacecraft Mission and Instrument Development Experience Gravity Recovery and Interior Laboratory (GRAIL) mission Guest Scientist, 2012-2016 DAVINCI+: Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging+ mission proposal Co-I (NASA Discovery program Phase A Concept Study, 2020-2021) NASA representative on European Space Agency’s Science Study Team for the EnVision mission concept Phase A study (Venus remote sensing orbiter), 2018-2021 NASA Venus Landed Platform Science Working Group, 2018-2020 Seismic Atmospheric
    [Show full text]
  • NAMED VENUSIAN CRATERS; Joel F
    NAMED VENUSIAN CRATERS; Joel F. Russell and Gerald G. Schaber, U.S. Geological Survey, 2255 N. Gemini Dr. Flagstaff, AZ 86001 Schaber et al. [I] compiled a database of 841 craters on Venus, based on Magellan coverage of 89% of the planet's surface. That database, derived from coverage of approximately 98% of Venus' surface, has been expanded to 912 craters, ranging in diameter from 1.5 to 280 krn [2]. About 150 of the larger craters were previously identified by Pioneer Venus and Soviet Venera projects and subsequently forrnally named by the International Astronomical Union (IAU). A few of the features identified and nanled as impact craters on Pioneer and Venera images have not been recognized on Magellan images, and therefore the IAU is being requested to drop their names. For example, the feature known as Cleopatra is officially named as a patera, although it is now generally accepted that Cleopatra is a crater [I]. Also, the feature Eve, which has been used to define the prime meridian for Venus, was erroneously identified as an impact feature, but its true morphology has not been determined from Magellan images. The Magellan project has requested the IAU to name hundreds of craters identified by Magellan. At its triennial General Assembly in Buenos Aires in 1991, the IAU [3] gave full approval to names for 102 craters (table 1) in addition to those previously named. At its 1992 meeting, the IAU's Working Group for Planetary System Nomenclature, which screens all planetary names prior to formal consideration by the General Assembly, gave provisional approval to names for an additional 239 Venusian craters.
    [Show full text]
  • Wicked at the Paramount Seattle
    DECEMBER 2019 DECEMBER 6 - 15 THE PARAMOUNT THEATRE And to all a good HELP BRING UNSHELTERED FAMILIES INSIDE. Over the last three years, Mary’s Place has moved over 1,400 local unsheltered families into warm, stable homes and provided emergency shelter to hundreds more. Support for their No Child Sleeps Outside campaign from The Starbucks Foundation and the community helps make it all possible. Help reach this year’s $2 million goal by Dec. 31 and bring even more of our neighbors inside, for good. DONATE TO MARY’S PLACE TODAY starbucks.nochildsleepsoutside.org Text FAMILY to 73356 to learn more about how we can help bring unsheltered families inside. Message and data rates may apply. Text STOP to 73356 to opt out, text HELP for more information. By opting in, you agree to receive recurring messages from Starbucks, which may be sent through an automated dialing system. Consent is not required to purchase. © 2019 Starbucks Coffee Company. All rights reserved. December 2019 | Volume 24, No. 2 WELCOMEFrom Seattle Theatre Group, a non-profit arts organization Welcome to the Seattle premiere of THE HARD NUT, the second show of our 2019-2020 Broadway at The Paramount season! Now celebrating its 28th anniversary, Mark Morris Dance Group’s lavish, gender-bent love letter to The Nutcracker is a brilliant blend of ballet, modern, and folk dance that offers an updated classic fairytale that is fun for the entire family. As a season of reflection and thanks is upon us, we want to take this opportunity to thank you for your continued support.
    [Show full text]
  • Chemical Composition of Earth,Venus, and Mercury
    Proc. Nati. Acad. Sci. USA Vol. 77, No. 12, pp. 6973-6977, December 1980 Geophysics Chemical composition of Earth, Venus, and Mercury (planets/solar nebula/element abundances/mantle/core) JOHN W. MORGAN* AND EDWARD ANDERSt *U.S. Geological Survey, National Center, Reston, Virginia 22092; and tEnrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 Contributed by Edward Anders, September 15,1980 ABSTRACT Model compositions of Earth, Venus, and Frct'ion Condensed 0.2 0.4 0.6 0.8 1.0 Mercury are calculated from the premise that planets and K chondrites underwent four identical fractionation processes in -V,Zr, Re the solar nebula. Because elements of similar properties stay -Al 0 1Pt rnefa!5, REEU,Th -AL together in these processes, five constraints suffice to define the 1600 CoTi03 CONDENSATE composition of a planet: mass of the core, abundance of U, and the ratios K/U, Tl/U, and FeO/(FeO + MgO). Complete abun- 140C.ACo2Al~~~~~~srO7MgAI204 _ 1e~lo~ ~ ~ q2iO.MS0 MTA dance tables, and normative mineralogies, are given for all three ~ 2°S'4 Mg S IO3m SILICTE planets. Review of available data shows only a few gross trends ifa.K)AISi3O for the inner planets: FeO decreases with heliocentric distance, Me0tal Silicates MnS whereas volatiles are depleted and refractories are enriched in Cu, Ag,Zn Ga the smaller planets. Ge, Sn, Sb 800 Fe H 0 F, \ FeO+H2 C1,Br, VOLTILES _ I1i It has been known for over a century that the inner planets 'FeHSFeS.H22 SSeTe 600 14GC~~~~~~~~~~~~~~~~MgAFeS differ in density and, hence, in composition (1, 2).
    [Show full text]
  • How Does Venus Lose Heat?
    JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 100, NO. E8, PAGES 16,931-16,940, AUGUST 25, 1995 How does Venus lose heat? Donald L. Turcotte Departmentof GeologicalSciences, Cornell University,Ithaca, New York Abstract. The tectonicsand volcanismof the terrestrialplanets are controlledby the loss of heat from the planetaryinterior. On the Earth, about 70% of the heat flow throughthe mantle is attributed to the subductionof cold lithosphere.In order to understandthe tectonicand volcanicprocesses on Venus it is necessaryto understandhow heat is transportedthrough its mantle.In this paper, three alternativeend-member hypotheses are considered.The first is the steadystate lossof heat throughthe mantle to the surface in analogyto the Earth. However,without plate tectonicsand subductionon Venus, a steadystate requireseither a very high plume flux or very rapid rates of lithospheric delamination.The requiredplume flux would be equivalentto about 80 plumeswith the strengthof the Hawaiian plume. The required delaminationflux impliesa 50% delaminationof the entire Venus lithosphereevery 10 m.y. Neither appearspossible, so that it is concludedthat Venus cannottransport heat throughits mantle to its surfaceon a steadystate basis.The secondhypothesis is that there has been a strongupward concentrationof the heat-producingelements into the crustof Venus; the heat generated is then lost by conduction.Surface measurements of the concentrationsof the heat- producingelements place constraintson this model. If everythingis favorablethis hypothesismight be marginallyacceptable, but it is consideredto be highlyunlikely. The third hypothesisis that heat is lost by episodicglobal subductionevents followed by long periodsof surfacequiescence. The near-randomdistribution of craterssuggests that the last subductionevent occurredabout 500 Ma. This model impliesa thick thermal lithosphere(•-300 km) at the presenttime, whichis consistentwith a varietyof surface observations.Lava lakes on the Earth are consideredas analogiesto plate tectonics;they also exhibit episodicsubduction events.
    [Show full text]
  • Borough of Kinnelon County of Morris
    OPEN SPACE AND REC R EATI O N PLAN UPDATE - 2012 for Borough of Kinnelon County of Morris Compiled by The Land Conservancy with Borough of Kinnelon of New Jersey Open Space Advisory An accredited land trust Committee March 2012 OPEN SPACE AND RECREATION PLAN UPDATE - 2012 for Borough of Kinnelon County of Morris Produced by: The Land Conservancy of New Jersey’s Partners for Greener Communities Team: “Partnering with Communities to Preserve Natural Treasures” David Epstein, President Barbara Heskins Davis, P.P./AICP, Vice President, Programs Kenneth Fung, GIS Manager Aaron Cela, Land Preservation Specialist Christine Bell, Planning Intern Kathleen Caccavale, Project Consultant For further information please contact: The Land Conservancy of New Jersey Kinnelon Borough an accredited land trust Open Space Advisory Committee 19 Boonton Avenue 130 Kinnelon Road Boonton, NJ 07005 Kinnelon, NJ 07405 (973) 541-1010 (973) 838-5401 Fax: (973) 838-1862 Fax: (973) 541-1131 http://www.kinnelonboro.org www.tlc-nj.org March 2012 Acknowledgements The Land Conservancy of New Jersey wishes to acknowledge the following individuals and organizations for their help in providing information, guidance, and materials for the Kinnelon Borough Open Space and Recreation Plan Update. Their contributions have been instrumental in the creation of the Plan. Open Space Advisory Committee: Carol Sventy, Chair Stephen Cobell, Council Liaison Gene Orcutt, Vice Chair and Planning Board Liaison Carol Vreeland, Environmental Commission Liaison Glenn Sisco Amanda Hagl Tom Kline, Historical Commission Liaison Vanessa Smalley Steven Pileggi Mayor and Borough Council: Robert Collins, Mayor Stephen Cobell Gary Moleta Andrew SanFilippo James Freda Ronald Mondello Dan O’Dougherty Borough Staff and Boards: Elizabeth M.
    [Show full text]