专家:地球曾有两个月亮
<p><span word="Earth">Earth</span> <span word="may">may</span> <span word="once">once</span> <span word="have">have</span> <span word="had">had</span> <span word="two">two</span> <span word="moons">moons</span> - <span word="the">the</span> <span word="one">one</span> <span word="that">that</span> <span word="shines">shines</span> <span word="at">at</span> <span word="night">night</span> <span word="today">today</span> <span word="and">and</span> <span word="a">a</span> <span word="smaller">smaller</span> <span word="companion">companion</span>, <span word="according">according</span> <span word="to">to</span> <span word="a">a</span> <span word="new">new</span> <span word="theory">theory</span>. <span word="A">A</span> <span word="slow">slow</span>-<span word="motion">motion</span> <span word="collision">collision</span> <span word="between">between</span> <span word="the">the</span> <span word="two">two</span> <span word="is">is</span> <span word="believed">believed</span> <span word="to">to</span> <span word="have">have</span> <span word="created">created</span> <span word="the">the</span> <span word="mountainous">mountainous</span> <span word="highlands">highlands</span> <span word="on">on</span> <span word="the">the</span> <span word="moon">moon</span>'<span word="s">s</span> <span word="far">far</span> <span word="side">side</span>, <span word="as">as</span> <span word="debris">debris</span> <span word="from">from</span> <span word="the">the</span> <span word="second">second</span>, <span word="smaller">smaller</span> <span word="moon">moon</span> <span word="piled">piled</span> <span word="up">up</span>. <span word="The">The</span> <span word="side">side</span> <span word="of">of</span> <span word="the">the</span> <span word="moon">moon</span> <span word="facing">facing</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="and">and</span> <span word="the">the</span> <span word="side">side</span> <span word="facing">facing</span> <span word="away">away</span> <span word="have">have</span> <span word="strikingly">strikingly</span> <span word="different">different</span> <span word="topographies">topographies</span>. <span word="While">While</span> <span word="the">the</span> <span word="near">near</span> <span word="side">side</span> <span word="is">is</span> <span word="relatively">relatively</span> <span word="low">low</span> <span word="and">and</span> <span word="flat">flat</span>, <span word="the">the</span> <span word="far">far</span> <span word="side">side</span> <span word="is">is</span> <span word="high">high</span> <span word="and">and</span> <span word="mountainous">mountainous</span> <span word="with">with</span> <span word="a">a</span> <span word="much">much</span> <span word="thicker">thicker</span> <span word="crust">crust</span>. 日本作家村上春树的小说《1<span word="Q">Q</span>84》模拟了一个虚幻的场景：虚幻场景中天空会出现两个月亮，近日，某杂志以《地球曾拥有两个月亮》作为标题宣告了两个月亮可能不是幻想，因为美国圣克鲁兹大学行星科学家和瑞士伯恩大学的一组科学家提出了新的观点：地球早期确实存在两个月亮，现在我们在地球上看到的“一轮独月”其实是一个大月亮“吞噬”了小月亮最终形成的，两个月亮的撞击行程了如今月球坑坑洼洼的表面，以及略小的那个月亮最终被“吞噬”的事实。科学家还发现，如今月球靠近地球的表面相对比较平坦、光滑；而远离地球的表明地势起伏不定，有着较厚的地壳。</p><p><span word="The">The</span> <span word="moon">moon</span> <span word="and">and</span> <span word="how">how</span> <span word="it">it</span> <span word="was">was</span> <span word="created">created</span> <span word="has">has</span> <span word="fascinated">fascinated</span> <span word="mankind">mankind</span> <span word="since">since</span> <span word="the">the</span> <span word="earliest">earliest</span> <span word="times">times</span>. <span word="Records">Records</span> <span word="show">show</span> <span word="that">that</span> <span word="as">as</span> <span word="early">early</span> <span word="as">as</span> <span word="the">the</span> 5<span word="th">th</span> <span word="century">century</span> <span word="BC">BC</span>, <span word="civilisations">civilisations</span> <span word="in">in</span> <span word="Babylon">Babylon</span> <span word="had">had</span> <span word="mapped">mapped</span> <span word="out">out</span> <span word="lunar">lunar</span> <span word="eclipses">eclipses</span> <span word="while">while</span> <span word="Indian">Indian</span> <span word="astronomers">astronomers</span> <span word="had">had</span> <span word="worked">worked</span> <span word="out">out</span> <span word="its">its</span> <span word="monthly">monthly</span> <span word="elongation">elongation</span>. <span word="The">The</span> <span word="Greek">Greek</span> <span word="philosopher">philosopher</span> <span word="Anaxagoras">Anaxagoras</span> <span word="argued">argued</span> <span word="that">that</span> <span word="the">the</span> <span word="moon">moon</span> <span word="reflected">reflected</span> <span word="the">the</span> <span word="sun">sun</span>'<span word="s">s</span> <span word="light">light</span> <span word="and">and</span> <span word="by">by</span> <span word="the">the</span> <span word="second">second</span> <span word="century">century</span> <span word="the">the</span> <span word="moon">moon</span>'<span word="s">s</span> <span word="measurements">measurements</span> <span word="had">had</span> <span word="been">been</span> <span word="accurately">accurately</span> <span word="calculated">calculated</span>. <span word="But">But</span> <span word="there">there</span> <span word="was">was</span> <span word="little">little</span> <span word="further">further</span> <span word="development">development</span> <span word="in">in</span> <span word="our">our</span> <span word="understanding">understanding</span> <span word="of">of</span> <span word="the">the</span> <span word="moon">moon</span> <span word="until">until</span> <span word="Galileo">Galileo</span> <span word="Galilei">Galilei</span> <span word="drew">drew</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="first">first</span> <span word="telescopic">telescopic</span> <span word="drawings">drawings</span> <span word="of">of</span> <span word="the">the</span> <span word="moon">moon</span> <span word="and">and</span> <span word="noted">noted</span> <span word="that">that</span> <span word="it">it</span> <span word="was">was</span> <span word="not">not</span> <span word="smooth">smooth</span> <span word="but">but</span> <span word="had">had</span> <span word="mountains">mountains</span> <span word="and">and</span> <span word="craters">craters</span>. <span word="Telescopic">Telescopic</span> <span word="mapping">mapping</span> <span word="of">of</span> <span word="the">the</span> <span word="moon">moon</span> <span word="then">then</span> <span word="developed">developed</span> <span word="throughout">throughout</span> <span word="the">the</span> 17<span word="th">th</span> <span word="century">century</span>. <span word="The">The</span> <span word="Cold">Cold</span> <span word="War">War</span> <span word="between">between</span> <span word="the">the</span> <span word="U">U</span>.<span word="S">S</span>. <span word="and">and</span> <span word="Soviet">Soviet</span> <span word="Union">Union</span> <span word="in">in</span> <span word="the">the</span> <span word="second">second</span> <span word="half">half</span> <span word="of">of</span> <span word="the">the</span> <span word="last">last</span> <span word="century">century</span> <span word="inspired">inspired</span> <span word="further">further</span> <span word="exploration">exploration</span> <span word="of">of</span> <span word="the">the</span> <span word="moon">moon</span>, <span word="with">with</span> <span word="the">the</span> <span word="two">two</span> <span word="superpowers">superpowers</span> <span word="competing">competing</span> <span word="to">to</span> <span word="be">be</span> <span word="the">the</span> <span word="first">first</span> <span word="to">to</span> <span word="land">land</span> <span word="a">a</span> <span word="man">man</span> <span word="on">on</span> <span word="the">the</span> <span word="lunar">lunar</span> <span word="surface">surface</span>. <span word="By">By</span> 1959, <span word="Russia">Russia</span> <span word="had">had</span> <span word="sent">sent</span> <span word="spacecraft">spacecraft</span> <span word="to">to</span> <span word="the">the</span> <span word="moon">moon</span> <span word="and">and</span> <span word="in">in</span> 1966 <span word="Luna">Luna</span> 9 <span word="achieved">achieved</span> <span word="a">a</span> '<span word="soft">soft</span> <span word="landing">landing</span>'.</p>
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