LEADER 04040nam 2200697 a 450 001 9910973549503321 005 20251116140828.0 010 $a9780309174084 010 $a0309174082 010 $a9780309524070 010 $a0309524075 010 $a9780585144795 010 $a0585144796 035 $a(CKB)110986584752290 035 $a(OCoLC)44963977 035 $a(CaPaEBR)ebrary10041163 035 $a(SSID)ssj0000152215 035 $a(PQKBManifestationID)11136849 035 $a(PQKBTitleCode)TC0000152215 035 $a(PQKBWorkID)10339157 035 $a(PQKB)11714860 035 $a(MiAaPQ)EBC3375743 035 $a(Au-PeEL)EBL3375743 035 $a(CaPaEBR)ebr10041163 035 $a(OCoLC)923258546 035 $a(Perlego)4734052 035 $a(BIP)53858324 035 $a(BIP)47623507 035 $a(EXLCZ)99110986584752290 100 $a19980603d1998 uy 0 101 0 $aeng 135 $aurcn||||||||| 181 $ctxt 182 $cc 183 $acr 200 14$aThe exploration of near-earth objects /$fCommittee on Planetary and Lunar Exploration, Space Studies Board, Commission on Physical Sciences, Mathematics, and Applications, National Research Council 205 $a1st ed. 210 $aWashington, D.C. $cNational Academy Press$d1998 215 $a1 online resource (44 p.) 225 1 $aThe compass series 300 $aBibliographic Level Mode of Issuance: Monograph 311 08$a9780309060837 311 08$a0309060834 320 $aIncludes bibliographical references. 327 $aFront Matter -- Foreword -- Preface -- Contents -- Executive Summary -- 1 Introduction to Near-Earth Objects -- 2 Status of Current Research Programs -- 3 Future Research Activities -- 4 Technological Aspects of Studies of Near-Earth Objects -- 5 Conclusions and Recommendations -- Glossary. 330 $aComets and asteroids are in some sense the fossils of the solar system. They have avoided most of the drastic physical processing that shaped the planets and thus represent more closely the properties of the primordial solar nebula. What processing has taken place is itself of interest in decoding the history of our solar neighborhood. Near-Earth objects are also of interest because one or more large ones have been blamed for the rare but devastating events that caused mass extinctions of species on our planet, as attested by recent excitement over the impending passage of asteroid 1997 XF11. The comets and asteroids whose orbits bring them close to Earth are clearly the most accessible to detailed investigation, both from the ground and from spacecraft. When nature kindly delivers the occasional asteroid to the surface of Earth as a meteorite, we can scrutinize it closely in the laboratory; a great deal of information about primordial chemical composition and primitive processes has been gleaned from such objects. This report reviews the current state of research on near-Earth objects and considers future directions. Attention is paid to the important interplay between ground-based investigations and spaceborne observation or sample collection and return. This is particularly timely since one U.S. spacecraft is already on its way to rendezvous with a near-Earth object, and two others plus a Japanese mission are being readied for launch. In addition to scientific issues, the report considers technologies that would enable further advances in capability and points out the possibilities for including near-Earth objects in any future expansion of human exploration beyond low Earth orbit. 410 0$aCompass series (Washington, D.C.) 606 $aComets 606 $aMeteoroids 606 $aNear-earth asteroids 615 0$aComets. 615 0$aMeteoroids. 615 0$aNear-earth asteroids. 676 $a523.44 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910973549503321 996 $aThe exploration of near-earth objects$94365230 997 $aUNINA