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Space: A Visual Encyclopedia PDF

258 Pages·2010·32.03 MB·English
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featuring the latest imagery from nasa SPACE a v i s u a l e n c y c l o p e d i a Space: A Visual Encyclopedia DK PUBLISHING Contents LONDON, NEW YORK, MELBOURNE, MUNICH, and DELHI Consultant Peter Bond INTRODUCTION 4 Project editor Wendy Horobin Project designer Pamela Shiels OBSERVING THE UNIVERSE 6 Editors Fleur Star, Holly Beaumont, Lee Wilson, and Susan Malyan What is space? 8 Designers Rachael Grady, Lauren Rosier, Our place in space 10 Gemma Fletcher, Karen Hood, Clare Marshall, A circle of stars 12 Mary Sandberg, and Sadie Thomas Early ideas 14 US editor Margaret Parrish Telescopes 16 Indexer Chris Bernstein Giant telescopes 18 Picture researchers Ria Jones, Harriet Mills, Seeing light 20 and Rebecca Sodergren Infrared astronomy 22 Production editor Sean Daly Messages from the stars 24 Jacket designer Natalie Godwin Invisible rays 26 Jacket editor Matilda Gollon Hubble Space Telescope 28 Publishing manager Bridget Giles Witches and giants 30 Art director Martin Wilson Observatories in space 32 Unusual observatories 34 Packaging services supplied by Bookwork THE VIOLENT UNIVERSE 36 First published in the United States in 2010 by DK Publishing What is the universe? 38 375 Hudson Street, New York, New York 10014 Birth of the universe 40 100 billion galaxies 44 Copyright © 2010 Dorling Kindersley Limited Galaxy formation 46 A sombrero in space 48 10 11 12 13 14 10 9 8 7 6 5 4 3 2 1 The Milky Way 50 175938—05/10 The Magellanic Clouds 52 The Local Group 54 All rights reserved under International and Pan-American The heart of the Milky Way 56 Copyright Conventions. No part of this publication may be When galaxies collide… 58 reproduced, stored in a retrieval system, or transmitted Active galaxies 60 in any form or by any means, electronic, mechanical, Dark matter 62 photocopying, recording, or otherwise, without the prior written permission of the copyright owner. Published in Great Britain by Dorling Kindersley Limited. LIFTOFF! 64 A catalog record for this book How rockets work 66 is available from the Library of Congress. 3, 2, 1… 68 The space shuttle 70 ISBN: 978-0-7566-6277-6 Launch centers 72 Launching Ariane 5 74 Color reproduction by Media Development Artificial satellites 76 and Printing Limited, United Kingdom Satellites in orbit 78 Printed and bound by Toppan, China Satellite shot 80 Space probes 82 Discover more at Space debris 84 www.dk.com Space nations 86 THE MOON 178 Super spacecraft 88 Earth’s companion 180 HUMANS IN SPACE 90 Eclipses 182 The lunar surface 184 Space pioneers 92 Destination Moon 186 Becoming an astronaut 94 Man on the Moon 188 Space walking 96 Splashdown! 190 Living in space 98 Return to the Moon 192 Animals in space 100 Extending the house 102 THE SUN 194 The first space stations 104 The International Space Station 106 The Sun 196 Science in space 108 Inside the Sun 198 Space tourism 110 The Sun’s atmosphere 200 Future flyers 112 Solar storms 202 Reaching for the stars 114 Amazing aurora 204 Solar cycle 206 SOLAR SYSTEM 116 Observing the Sun 208 Birth of the solar system 118 STARS AND STARGAZING 210 The Sun’s family 120 Mercury 122 What are stars? 212 Venus 124 Birth of a star 214 Views of Venus 126 A flash of brilliance 216 Mars 128 The death of a star 218 Missions to Mars 130 Interstellar space 220 Martian sand art 132 Multiple stars 222 Asteroids 134 Globular clusters 224 Jupiter 136 Other solar systems 226 Jupiter’s moons 138 Extreme stars 228 Voyager 1 & 2 140 Black holes 230 Saturn 142 Be a skygazer 232 Saturn’s moons 144 The night sky 234 Saturn by sunlight 146 The northern sky 236 Uranus 148 The southern sky 238 Neptune 150 Pluto and beyond 152 Space in time 240 Comets 154 Glossary 244 Comet missions 156 Index 248 Meteors 158 Acknowledgments 254 Meteorites 160 Life on other worlds 162 EARTH 164 The unique Earth 166 The perfect planet 168 Earth’s seasons 170 On the surface 172 Up in the sky 174 Life on Earth 176 Introduction Only about 500 people have left Earth behind to explore the wonders of outer space. Now you, too, can voyage through space and time and enjoy an experience that is out of this world. As you turn the pages of this lavishly illustrated encyclopedia, you will learn about how rockets and telescopes work, discover what it is like to work and live in space, and unravel the mysteries of the final frontier. You’ll travel from our small, blue planet to strange worlds with poisonous atmospheres, hidden oceans, and huge volcanoes. Then head out into the Milky Way to discover the multicolored clouds, stars, and galaxies that lie scattered throughout the universe. LIFTOFF!LThbreuCevanhmesdeire nae svasir aieni n,ncr eyFco dute rnhfi .ets ernhTts rceoUtnuh dlmcSa aGt uyaiao,niucn nnlcida ah Uu inthn nshaS ic,met ahe IUnsan snddwSityc iSeeRa rRcs,ue oeha, s ulnasaonivdnnacet dnarS tib oeetleahdsuteu,e t nonsihene nc b Kch humlr uoaiclvrdietlee siinao ntta.rger raysr e PMlooAnlctoaeoetfnoraul phnocerltdny-ethttrsiseihce renecear h etml cmgd aCasesr miuksd.meini tstn rTh i(sc ficotcsRirsetllifohse eete i1umM, edsl sec 9 sa iaa eisto5btPntneniess7oa dld ctsie.ue)etn o srxitFrtew noh itot5isgch.esstrL 0kk Pee laSAm0e n olntowte Ucchsmadvsaoe aneiN ht erisntieyllaptsnCed d kvfaysg — reH1 cecooh( e9alb8vm ao or8Cee0lsssvar 3e ,e0Ebeaun n. i rneN tntmk o ey1cmwTn e h,t5na hE) as 0teR 0 aS LIFTOFF! vKfiwdere ahsTntsi ncHuSleeasdeI tadSyus rsSoRennpmO a VtbchC eltey oKC AbbeEupenTo itlllea,dl rousi,h n n4wogc w ahmasent id ts this.hin eIoe tn t h.e RhatFejAehalilotwNogsetcth riaws ksiylIedoyeasDanat r,psl d eoc Esoda,ouc prA oaacesutvshtL etanleuBba ,ad gboarao SttTwo esihettkvi IsH nhdeoCoSp T)nfe p Ereiauraauk nE errAlprFtts lmnmeoiI e tni iRawko ln iosaCrt Ste1h,btnttT e oliaeesat lt nU. o .dlni apt cd aRS hull t SvYnaaOeooReucuc hc rrwectwn iakap seGaacla.eka s thdato nAeeu sg bn rs,a s oe.u lrsi d aaiifftti nlnutehtt o es(danoe s lth nvaa c aourehewnenra nc yrh BABKpr.atThfSoahrpa alaraneeAlade i z itkgycslRRskhaaie eo,tcek uIo euAa. nAn nh ErnsagMucirNsustenhuy itnrrK aeEai,eorpcds nonp y aas (t.5ue fyi. Rrmar l rclaroeThooneoucma ua ncakd.snk n etsiseen ndtiBrseag adrs) osii tktflcuaokitagneitohtue ntdrtse s “,osa ctnnaosnd sstdm htpa eaolr a tfld9neard3eot t0,mta hdrmeyee”r sime leie rni itn(sce1s ldi1u,o5 9dpn05els0as5 i a dn.kr oesm zol)eaf nu lnosn neocighgf herlaodbuc ofknrreocinthm gt e st KThGtbefu1bahqyo9svuoeeu o6eot diua esh6arl ttrquaptnaoa.e ooo nebfus ac wArrrRTu laasaiotnieo a tHhtursn(mn ioel otEeso aneoEhfros wne,nmiu toMrr laPh w fobe rao nLpaife uoinrhofo itE an SrgndpEsiftdeSyc ,h o hestay t EEhth.ayohahi raTes nuutunaegi nhrrdSlzs ti da ’obS v Ksf r tluaw peelapehr amnssleucoeakeat aceiatntu e clihnhyanstincne.ehte e tcshA iss al h eAotlipyembrir htn.svr oa egi b.eecautc Th e efoiextiewo nn neinip4srme noc 0tdoF s hl ryi,sriruabt0elit)etud utmu0i nnaeos.n0ie t icn laIe hncethstdrse hnac bf riiseeaovyesn sri rrbJ cne g uieeu ney elsay tnero CThcfi1lLnfKraooe9roauearncsu5rni ntpktstSn 8ne hcerealc,rothea t ,shCotd cuue lhf khsyornaC e neC acacnS tov asnh aVpaietmw dptvea c eb daelcepe tas eehr nhlCu oe ealateCnnanxleas u o c rn e3blt hnnnaash9euetcvtlee,ayeshen nr. rlsre oco.t iaTh detthncIlhed, naee t e itdwo h ls etfi m feoofadfa errastrr ea oa oneaam ilmainn s,dno a imda a lcsnt1d en ehmokn9d n earnie5 it eisisdCeor0ln sa rt wi.b amh nl tfepSanhaod isien tesr nea.ets . sUoc1i5s otThe 9t0 tS nh6h0 see0e . s JTht(walftaTsSllRaiarhh1ii rhmotouuuLaut,eeeedi6simsnno q ifis nGfisfat0fi ccnuioce lzyfa0hhJarogidtrh,a ias u hee abu JtonkClMdstn ni iqumo,nuus hc(daDut t aasqChsshit)o eratnoupMe e cied nwhclouaasaah l e,e’Mvioncineist -tnnrnmh oesn1 e mttitct aiae , gs 1eodai rroao )a1noraok9 t s-f nlflhf,ltt1ici 6a0itonsBenyeaku, 0 0r s g.iseeenobnl. na0id ai ttrutcCjI g uu ibenhmtn nlhaio ltig1taiicivt.teln n h9eeeadiars s 7n i0dn, ThThpoits1nraf2laia l tCneetsdh f s maoaOtefolyer iPomr sfdar,osa ye t,crts dshniiwusfit einteehacno yu, in Oc stta(ehhhuStact eeareeal l aacarO tulonhh aLndc.eeu kc dayAnehesu qc tstesnohe uasiy c s atasr ehtiolp oltaZ lclecuriake, totn ieneasfm cto i itstjhsrohhp mefpue ardr ror.noO.e nm Thypcedk)a yytere hesto s,dpef e t lmy1oah t1neifnd osth dromol er e u GENERAL ARTICLES focus on particular topics of interest ( p. 72–73). Many have fact boxes, timelines that chronicle key stages in development, and picture features. Packed with beautiful images from the world’s most SOLAR SYSTEMMApohair.MmbahaaTMtcDsbbohoMehof taeag r uehesa fenacMlnalasEmle sotfoea afaestfttAraa raa sdi tus aostyrs.oIelhoinr ahub sn tlsNlsefi RymtetnesleP tesre re h—y Ena rl frealhlI eMssa . dTahaletg i rorl a stsvMmicoara erat ccooaiaEteo oIhbigso hof hiamrrurnbliAap loA lsefeaydalntod areuet eidoRliEor rweas dtsestNtdhiu ar ecs an S-tm - d rtrR Roo rrttts o -irto lo h a -tf hshpM cP leh estor k.aaim sear ,h ditcktulmrc orO ci oeuwaMtgl emshevb dlcthOcle aaso ,eor stras analsarebrteNnyl t r on la oa3 cedas2lgSnarc asc sr f spdo4rkok,i cteg tts a,ed D(nsuwe o lh1mp.lrtr ese oehhootm di.idtthmn fe aiuo M)Sac bt honrwotbtmyhishs -aec .aDsM ai kbThcocilrrneoksoasiahs ie .pvt mrnb tecywes.e y. aergod sl IeBoamucs u,td Spino sarasmrs iaaoMrtog in nuteoyabnhnn dc laaadc dkl snbo,a d barlteye lme yb l s ooieo lfyit ieds fi s ldi c a te TbaititeccchhvaroeehereiiVwTct. cc benah svkkTeihrhor se ae ebieMinehranr tr RThomotatstsawoeyan oa e hhetusnldtaarn frs idrawipdm ee asunrraeamPinsdi fiTye oo taisddkr ntmdampiffiO tt spcxe unEsmaiec1Myo gese oee’iscmetnabsLsLeavu.rdrs e rhxko8 Mi rems e nALer-aennsiiepdaoneulr ryitnrdo dr rm,lrtgsyoaRiai reMuid yt)tenc tueaeagn arbhld i.ms ,s itrereaspt atmrnh Ile hTtuoEpt .. ssaenieC n(np ,w n,utgn i ospt −Ia fh dnosst ME we cbe toocldiu1 s(. ie o an aa-igt uh3mtkuraem 6ffhcrCrror nOn ,RAdfant h l dy eep6M aooikoodc dAnoe d e euc tdeRartn°lacrmfcOts ichdru aruhFg a hePtpsa,aoaw Et mw b uen li sha/t)Rmh tpnaw ryalSfy.ait−s oiiacesvsna.esuon tsnB ta td. 1m t ehmi trteab2gaulatend Inh 1relei pttr r0rT,a rslra er g 0 oe eehsyd 0a atEa aia ° o −pne5ssnnCsttfR k .1ah.lo tcoa te,lge eyIe9h syfRa rtr. zOeas5 s sE epsaiao°r nuPhmFniborssOni, tt int (ro nesau7−Rf reen am 71rtTtwdsha.°2e leaoFtNnsTh 5,shbst uA°scsl(e aeChr2ecS rfueaS avA5)cdnnuec k’°sc eo aCn wth,Mfyan oe le)tksord aa i e eo imtdr itknhsnus e e srt . TMToaati5sactr6 hl hr aal1 MouTsee mreh6Mth rss hh amB so huiepthme,al uRh geeerobrai essneiiatEeoss l g g,nnt uite(Ww its h 9s ssn i hOJuMea omTtu0nI(ed sNnAuni2dl np oyklekltor6KGagidm orumyse3f reE o knn g0bptctsApO)f oomst e, oelA u a ca iao s S1vEv elwnrst )c sT9yeLxeca .t veravo h9rimo OtOoteAstir oe9,lietsmrsm dOgrRt .pl aresoc c h .lsKo3Mtuaottna ath ahnsn7n.s:li kt ltatod 5DoeIh e itu onistd e te sUsgmihf s s shtOst eS Euhiuhi nltaTrnreluAierhfyifs e sarg at ecSmrec Schclrat(el aeTeHeoo6eitnp.n s.uioO i0e mtAuBsTsddd eo0 Rt soPu l,rhoebo l dM EtfMakaisyt na ro t snmhSyh S roodsf,aiHe og)ynfnt h rshpIgse tFe,lelvweai - TiqmbtnidneurEeemod.itnR wds d.pc nweoe rdetaahsutt easutrt Olsr aoelrl aygmre sstpyuDpt uht3avhsoto orsue,aelG el0 ma Mvsc2tatar0oeE. s5 onbp 0i Tnl0ocol o some f fT it wtmin css itI a( dshttNpo 1phhdoehfe, evl G (0 ep we t (0hr ol4iL a0efnt0 n hA twdm0heeR. ht e nk) GHia iTMAThotmhmnerErih iotsgda/aaegihRnhrha r ghvessme )e,i-roM.a s,)lnP l e.Ta cMkoa i avynnvihneo co slonle kna me twIv(rsiisedn3es antas Asiu lMkugrnpkflTasusaeesoltclm dtf ytoanour hu rt na.ocs)rgei sppi.e sef msmer.tsd s r,u . moat, eehApt ahs o ethr aidhonuehpNsmnecr e doe.ge svh t t fiDt IsKeahoti t rh sl s casct wslwpaa.Ls tale bn ValCateonaaoiAin use inhusn2n V kd tRdicrgd tdheali myo asdn,ePGleflss ldkv egiai iaoon l s oEeetoePnn1 fhngrsfd Re ld fi .u aL.avds n nrpiataSux dhint stT es hedtihrta eeI o .r Lu LrMs ARSSOLAR SYSTEM powerful telescopes and full of amazing facts, this 12Do3r80eb iihmto ooufsr Msc.omarps leevteesr yo n e Ponheo boorbs iits emveurcyh 7 c lhooseurr ts o4 M0 marisn, ucotems.pleting uthoe rMbee i Oinn Ut dhNeee CTp hAfraIerNeizte uF—mR kOMnSoowTntn eM sa Mus cpoheu ronmft aathfirneo sMs.t—arstuiacnh asus rtfhaec ef rios stth sohuogwhnt 7(■■■■■1174 E°2ASDLLFa eeuvmi rann(ert−ihmfgglr1al aittd2eochhga5nte eeyoo t m) rtffode idy i2lm4seea5,ts2apy°a 0re C(n 20 2r) c2 6a4m8e8t.5 ui7 mlf re rhEeiosolal mui( ro6−tr hn,s1t8P h9dk0e5maL0 y tSA)kso mu Nn) E T P(■■■ER aNGSOrirtuzhaFme vI= ibcL t1eyoE) rm a o0tp f.ta3 hm8reios soounnrsf a 2ce T4 hbei lLlioown eyVltTi(lish4elka ha e2,ecl0 irl,r Mses5a0a sso 00t yasMelc0s drrtkat e.ammirimsar ji)in u nl o elseeofst rq nc biuagse a.nrlotuyowonrn. s s encyclopedia is invaluable as a reference book for u DETAILED PROFILES accompany features researching projects or perfect for just dipping into. about our solar system ( p. 128–129). These are packed with facts and figures about the structure, composition, and features of For anyone who has ever stared up at the night sky and each planet. wondered what the universe is really like, this book is an essential read. Giant telescopes Keck Telescopes Gemini Telescopes GIANT TELESCOPES OBSERVING THE UNIVERSEThEphteoaqlveweues iecH pbropfeapueeleeldn s t t ewabelrlueieetsi shlcncto o oawppw 1eiet 6 phec vl faamteun r(si n5erbred uomd irq,l)s tuw .mu iAtipteishr tar toom es rct3,ihi r3rirnt ow fowtrhl soa( e1osgn 0fyt h i1mhte0 a w)0ls a a airfsmcgt r ce(opos3strm0s oa. v pnmEelddve) te ,moe ntdre o l lmasientrs og c1eroe9rp. 4e8s . ■■■Uwtoaceht v elmnSLAeaeroiltrnseztcoicice lgatsto o utoe2phidmpfso0he e pen s e0e rs wh1 sir.9Mm3 eaotTh,,a 6pa hrbut0rleehny0yde a e 2mf’d sutKK , iit(s0elr4sweairat,0no1cr,oi 4r0gHkngr 5 ea t3 tIawmisK3inIt ma)fm egtito ice( e1pikelrs0efft r istpmoecece)rcalor etltp sshs ceeoao ctfpo tenhsde . ■■■ThattostaiSSnhehooo r f sleuuSLA tueeepbeetto i ylhhtslzt eercooh ::icetn qcatcC8two ucetoiahe,ueida9arpfiontr an3 etnlr petno e0 tch h rs s odNs oPGif eNemiktaaro n eg o.(ocrriea2n hrtneheBamnth,ro7oshy -e:l ,2l.e:sm r1 c eii mC2MptntnTh3ta whhi,moeiaick8riol ereus2)eheet oentndr2eed r an .ns ltef e tiw2K vt das(6eth4econ hea,frr2ot, deoy 1oH(pm8 3ufap e mmwg ,sa h) )ar . it i. OBSERVING THE UNIVERSE Peter Bond V(VerLyT L) aArgrrea Tyelescope LTealregsec oBpine o(cLuBlaTr) Hale Telescope TpaaiiMHdntblomaetaao ecawguvroelee,nfads et ipsa t riita h,henhK tnTeiec ese hrceE ceahbei lLg.t, ooe hfhLRasurmetn o dear M emimelsemt xtiaiE ootsnatnu ti gelMnedmdiea tc emsrtmaOt, bl n seovtyooR yeoul s il tEttlnegtoch e.shotwa.lcea.etfnyoin snot pcsahs o.eri esnepa r eaesr .e ■■■Th(48 SLAf.te2oil zt c (iVemat1 utoL.id)8foT e pnmt re 8 iaMlm),e6r or4astuae5crcny ylofet at m p sPcn(2caeior ,ros6wrna o3cpnas5oroaen i llrsmm2s,idk t.7gC)se bhhThf uftatoioioo ltcs(enmf 8ufighbe n. if2er un eiotg t trmamngeehu rmal)l odereeto rrhessss2vs cycr eb.a7fgoos rybt r ppoef olteeemmu s n d (sl(ttihe18igdle1.eh4e s.lt-8 ca bmoar ymgsp)- e eos)ps i ntidar neiacem nr tmtohdahsei rsamr y.trw oThomcorsor timller ldpr eLeo.oc■■■ThtmG(3awBrtw r,i sas 2SLArTaou her6eoilmosa0zr t rc i2Lmre fiiatmm ousn u 8,Bto2 )idulgAc 8fu o T efus nr pncfti3 itz rr tnh 1 oih 9r(eMm80nge d a., aonl47fase tu 0r tm ny0l ty ) f t ■■■Ewsme v acSLAaesooidln ztcnbieeat uduttoooid-ifofe ldlpn ta a ra, r5 i Pymgt,s5a,hie 8alnomes0rmtgy f Ho lattm ere(r 1 aieMlrp,el7 reotios0eh uc0rt cnm oa em1tenapl6) uei o enfstc6t, fhc huuC (0o5gioa sns pdllmliyw iaadtnfteie)ohrsesrneg argstenienr .roseciw m ds aitMrret mh etahiittivirefohineagtreri aegroghrds rnoe art. s,r gi ts ELaurrgoep Teaenle sEcxotpreem (Ee–lyE LT) Th(TMirtTy )Meter Telescope ■■ThsTh(1te4h 5 lSL2oe eioit susz cim cepmlarod reto)iip evf omc isopenno rs lma imu Cmdromhtyoiaepiial roar eemmyie innr( n umaliaetn irtiortogcrireyonr ohbnoor rgtjnfi rpe a r wetmtc1enhwo3treidia8adld vEl nt)tf awetieba ypos(tlire4. ehnll oti2 alsOosh1e rcnm ict b-3tnonlhoe)loai8ip tleet kr2sl ile rge fneo0o tce scgf1 tst a at8i tt r.ess . ■■■Thbw94aotuthel f89es milSLA ee le 2teocli l fhsz ot ftc tobice$hoh eatsmo( ue3 rtetoe3i3d p mxf o01ap eT03pean 0 0la rsp gMe1 m ift. Mmomr3t ttieAi,o ina)T2am(mdi un8rs1ali ny 7tln alte0iai r mnofros so tKdy me ni(nmeo2r4 igra ma,ob)0Tom0,om m5rsH1Ki Mr0e era89ee rerenwm8 t.vorTcl e ta)fise Arkstri(g iu .,w(i mht 3n sIm 0c tiiteo el t mltnaxswa hfi) dpshriaumeelenlr ce aui ctdnroep)otgdn lol ee tf co t When you see this symbol in the book, turn u FACT FILES take an in-depth look at one to the pages listed to find out more about a subject. topic, such as telescopes ( p. 18–19). They detail all you need to know about the subject. STARS AND STARGAZING VltsrcgsAioehtarge8 fo lohFl1ll3wleewta0L8cd-irs,tyn A 0 iMafehng0 lSaola,g0ori Hswg bs nho thu ao if atOmswtfc w beiteaetFhceury shoeie r sBifpt osntrliti.assoR’ nt oyTmn.ige IsfTho rL loasEreih Lmug roaeihetmIrf awdstt Aldp ha afsbNueg.rru ocrdesIpiCttmsn g a aet mhcEnr Mhtugtdahanilatk aaeel rnre isscsg u sthetih. ratff s Tr tr2tleoi aon0hscuropt0g,en kr 2liseudos ,eaa p ccrdtsta iahh me ituoefiess s uodt soeshtr tdftae ae ai b irn brom.no tyfTseou au tbl htghids ugeip2edslsh a 0a enetbc ,n ffie0eeftlbr,es0ly ooecu 0lmwftlf al i ai .sstr h ede STARS AND STARGAZING May 20, 2002 September 2, 2002 October 28, 2002 December 17, 2002 216 MsltSithgaerohropr tuee ti rgtseuhh smp atttinhelblde f es,odp ruturh res2e aty 0dececila0onhr6uogs d aoo.fuf t ett hr et 2he1 7 u PHOTO SPREADS capture items of special interest within each chapter, such as exploding stars ( p. 216–217). 5 E S R E V I N U E H T G N I V R E S B O OBSERVING THE UNIVERSE O B S E R V I N G T H E U N I V E R S E We live on one tiny planet in the vast universe. Finding out what else is “out there” has been one of our biggest challenges, and it started with people simply staring at the sky. What is space? FACT FILE ■ In the US, anyone who flies above an altitude of 60 miles (100 km) in a rocket or spacecraft gets a special badge called We live on a small, blue planet called Earth. “astronaut wings.” E RS ■ Our most common name for people who It has a surface of liquid water and rock and E travel into space is “astronauts,” meaning V NI star travelers. The Russians call them is surrounded by a blanket of air called the U “cosmonauts,” meaning travelers through E atmosphere. Space begins at the top of the H the universe, and the Chinese name is T “taikonauts,” from their word for space. atmosphere. It is an unimaginably vast, G N ■ A person who stepped out into space I without a protective suit would quickly die. silent, and largely empty place, but it has V R He or she would be unable to breathe, but E many amazing properties. S would still have around 10 seconds to B O reach safety before losing consciousness. , OUTER SPACE Even in places far from stars and planets, space contains scattered … particles of dust or a few hydrogen atoms. E C A P THE EDGE OF SPACE S Earth’s atmosphere does not end R E suddenly—it gets gradually thinner T U and thinner as you travel up from the O ground. Most experts agree that outer space starts at a height of 60 miles (100 km). Yet even above this height, there is a layer of very thin air called the exosphere. Hydrogen and other light gases are slowly escaping into space from this outermost part of Earth’s atmosphere. s Blacker than black le i m In photos taken from space, our planet is surrounded by blackness. This shows how 0 0 empty outer space is. Planets like Earth shine 0 6, , EXOSPHERE This top layer of the because they reflect light from the Sun. Stars atmosphere extends up to 6,000 miles shine because they produce huge amounts of (10,000 km) above Earth. energy by burning fuel. Most of space looks black because there is nothing there to produce or reflect light. s le , THE ATMOSPHERE protects i m Earth’s surface from harmful radiation 0 and the full heat of the Sun. At night, 6 it stops heat from escaping into space. 8

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