LEADER 04640nam 2200685Ia 450 001 9910812029903321 005 20200520144314.0 010 $a1-280-21460-0 010 $a9786610214600 010 $a0-309-57371-8 010 $a0-585-15545-3 035 $a(CKB)111004366657434 035 $a(OCoLC)70745586 035 $a(CaPaEBR)ebrary10056753 035 $a(SSID)ssj0000282877 035 $a(PQKBManifestationID)12040540 035 $a(PQKBTitleCode)TC0000282877 035 $a(PQKBWorkID)10324182 035 $a(PQKB)10970039 035 $a(MiAaPQ)EBC3376480 035 $a(Au-PeEL)EBL3376480 035 $a(CaPaEBR)ebr10056753 035 $a(CaONFJC)MIL21460 035 $a(OCoLC)923264057 035 $a(EXLCZ)99111004366657434 100 $a20040925d1988 my 0 101 0 $aeng 135 $aurcn||||||||| 181 $ctxt 182 $cc 183 $acr 200 00$aSpace science in the twenty-first century $eimperatives for the decades 1995 to 2015 : report of the study steering group /$fSpace Science Board, Commission on Physical Sciences, Mathematics, and Resources, National Research Council 205 $a1st ed. 210 $aWashington, D.C. $cNational Academy Press$d1988 215 $a1 online resource (121 p.) 300 $aSupport for this project was provided by Contract NASW-3482 between the National Academy of Sciences and the National Aeronautics and Space Administration. 311 $a0-309-03885-5 327 $aSpace Science in the Twenty-First Century: Imperatives for the Decades 1995 to 2015 -- Copyright -- Foreword -- Contents -- 1 Introduction -- 2 Scientific Goals and Recommendations -- GOALS OF PLANETARY EXPLORATION -- To understand the origin of the solar system. -- To understand the evolution of the planets. -- To learn what conditions lead to the origin of life. -- To learn how physical laws work in large systems. -- A BALANCED PLANETARY PROGRAM -- A MARS FOCUS -- SUMMARY OF RECOMMENDATIONS -- Scientific Investigations -- Technical Developments -- International Collaboration -- 3 Status of Planetary Science in 1995 -- OVERVIEW -- State of Planetary Exploration as of 1995 -- Scientific Questions as of 1995 -- PLANETARY GEOSCIENCES -- Scientific Objectives for Planetary Geosciences -- Formation -- Interior Structure, Dynamics, and Physical State -- Crustal Evolution -- Planet Morphology and Surface Processes -- Measurement Objectives -- The Inner Solar System -- The Moon -- Mercury -- Venus -- Mars -- Internal Characteristics of the Inner Planets -- Magnetic Fields of the Inner Planets -- Atmospheric-Climatic Connections of the Inner Planets -- Rocky Satellites -- Satellites of Jupiter -- Satellites of Saturn -- Satellites of Uranus and Neptune -- ATMOSPHERES -- Earth, Mars, and Venus -- Titan -- Io and the Plasma Torus -- Jovian Planets -- RINGS -- INTERIORS OF THE GIANT PLANETS -- PLANETARY MAGNETISM -- Generation of Planetary Magnetic Fields -- Earth's Magnetic Field -- Studying Planetary Magnetic Fields -- PRIMITIVE BODIES AND THE ORIGIN OF THE SOLAR SYSTEM -- The Origin of the Sun and Planets -- Search for and Study of Other Planetary Systems -- Asteroids, Small Satellites, and Meteorites -- General Characteristics -- Anticipated State of Knowledge in 1995 -- COMETS -- General Characteristics -- State of Knowledge in 1995. 327 $aQuestions in Cometary Science -- Comet Measurements and Technical Requirements -- 4 Future Programs -- PROPOSED MISSIONS -- Programs for Planetary Geosciences -- Types of Missions -- Planned Missions -- Programs for the Outer Solar System -- Types of Missions -- Planned Missions -- Future Missions and Programs for Primitive Bodies and the Origin of the Solar System -- A PROGRAM FOR INTENSIVE EXPLORATION OF MARS -- Why Mars? -- Scientific Objectives for a Mars Focus -- Role of Humans in Intensive Mars Exploration -- A Phased Approach -- RECOMMENDATIONS -- Exploration of the Solar System -- Exploration of Mars. 517 3 $aPlanetary and lunar exploration 606 $aSpace sciences 606 $aAstronomy 606 $aCosmic physics 606 $aSpace biology 606 $aPlanets$xExploration 606 $aRelativity (Physics) 615 0$aSpace sciences. 615 0$aAstronomy. 615 0$aCosmic physics. 615 0$aSpace biology. 615 0$aPlanets$xExploration. 615 0$aRelativity (Physics) 676 $a520 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910812029903321 996 $aSpace science in the twenty-first century$93968674 997 $aUNINA