美国宣布发现三颗“新地球”：地球可能从此不再孤单
<p><span word="NASA">NASA</span>’<span word="s">s</span> <span word="Kepler">Kepler</span> <span word="space">space</span> <span word="telescope">telescope</span> <span word="has">has</span> <span word="discovered">discovered</span> <span word="three">three</span> <span word="planets">planets</span> <span word="that">that</span> <span word="may">may</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="support">support</span> <span word="life">life</span>, <span word="while">while</span> <span word="one">one</span> <span word="of">of</span> <span word="them">them</span> <span word="is">is</span> <span word="the">the</span> <span word="most">most</span> <span word="earth">earth</span>-<span word="like">like</span> <span word="world">world</span> <span word="spotted">spotted</span> <span word="to">to</span> <span word="date">date</span>, <span word="scientists">scientists</span> <span word="say">say</span>.</p><p>美国国家航空航天局公开表示，开普勒天文望远镜已经发现三颗适合人类居住的星球。并且，科学家称，其中之一是迄今为止发现最像地球的星球。</p><p><span word="Two">Two</span> <span word="exoplanets">exoplanets</span> <span word="have">have</span> <span word="been">been</span> <span word="discovered">discovered</span> <span word="in">in</span> <span word="their">their</span> <span word="stars">stars</span>’ <span word="habitable">habitable</span> <span word="zones">zones</span>, <span word="what">what</span> <span word="is">is</span> <span word="known">known</span> <span word="as">as</span> <span word="just">just</span> <span word="the">the</span> <span word="right">right</span> <span word="range">range</span> <span word="of">of</span> <span word="distance">distance</span> <span word="where">where</span> <span word="liquid">liquid</span> <span word="water">water</span> <span word="can">can</span> <span word="exist">exist</span> <span word="on">on</span> <span word="a">a</span> <span word="planet">planet</span>’<span word="s">s</span> <span word="surface">surface</span>.</p><p>开普勒-62的行星系统中，两颗系外行星在它们恒星周围的宜居区中被发现，行星离恒星的距离适中使得行星表面理论上应保有液态水。</p><p><span word="Kepler">Kepler</span>-62<span word="f">f</span> <span word="is">is</span> <span word="a">a</span> <span word="rocky">rocky</span> <span word="world">world</span> 1.4 <span word="times">times</span> <span word="bigger">bigger</span> <span word="than">than</span> <span word="earth">earth</span> <span word="and">and</span> <span word="circles">circles</span> <span word="a">a</span> <span word="star">star</span> <span word="smaller">smaller</span> <span word="and">and</span> <span word="dimmer">dimmer</span> <span word="than">than</span> <span word="the">the</span> <span word="sun">sun</span>. <span word="Its">Its</span> <span word="neighbor">neighbor</span>, <span word="Kepler">Kepler</span>-62<span word="e">e</span>, <span word="is">is</span> <span word="just">just</span> 1.6 <span word="times">times</span> <span word="larger">larger</span> <span word="than">than</span> <span word="Earth">Earth</span>. <span word="Both">Both</span> <span word="are">are</span> <span word="the">the</span> <span word="smallest">smallest</span> <span word="exoplanets">exoplanets</span> <span word="ever">ever</span> <span word="found">found</span> <span word="in">in</span> <span word="their">their</span> <span word="stars">stars</span>’ <span word="habitable">habitable</span> <span word="zones">zones</span>.</p><p>开普勒-62<span word="F">F</span> 行星是一个比地球大1.4倍的岩石世界，它围绕着一颗比太阳小且暗的恒星运动。它的邻居开普勒-62<span word="E">E</span>行星是地球体积的1.6倍。这两颗行星是在它们恒星周围的的宜居区中所被发现的最小的系外行星。</p><p><span word="Both">Both</span> <span word="Kepler">Kepler</span>-62<span word="e">e</span> <span word="and">and</span> <span word="f">f</span>, “<span word="look">look</span> <span word="very">very</span> <span word="good">good</span> <span word="as">as</span> <span word="possibilities">possibilities</span> <span word="for">for</span> <span word="looking">looking</span> <span word="for">for</span> <span word="life">life</span>,” <span word="said">said</span> <span word="Bill">Bill</span> <span word="Borucki">Borucki</span>, <span word="the">the</span> <span word="Kepler">Kepler</span> <span word="science">science</span> <span word="principal">principal</span> <span word="investigator">investigator</span>, <span word="of">of</span> <span word="NASA">NASA</span>’<span word="s">s</span> <span word="Ames">Ames</span> <span word="Research">Research</span> <span word="Center">Center</span> <span word="in">in</span> <span word="Moffet">Moffet</span> <span word="Field">Field</span>, <span word="California">California</span>.</p>
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