科学家发现8个或有生命存在的行星
<p><span word="Eight">Eight</span> <span word="new">new</span> <span word="planets">planets</span> <span word="have">have</span> <span word="been">been</span> <span word="discovered">discovered</span> <span word="in">in</span> <span word="the">the</span> '<span word="Goldilocks">Goldilocks</span>' <span word="zone">zone</span> <span word="of">of</span> <span word="their">their</span> <span word="stars">stars</span>, <span word="orbiting">orbiting</span> <span word="at">at</span> <span word="a">a</span> <span word="distance">distance</span> <span word="where">where</span> <span word="oceans">oceans</span> <span word="and">and</span> <span word="life">life</span> <span word="could">could</span> <span word="exist">exist</span>.</p><p>科学家已经发现了8个新的可能有海洋和生命的行星。它们位于这些行星的恒星的适居带内。</p><p><span word="The">The</span> <span word="discovery">discovery</span> <span word="doubles">doubles</span> <span word="the">the</span> <span word="number">number</span> <span word="of">of</span> <span word="small">small</span> <span word="planets">planets</span> <span word="less">less</span> <span word="than">than</span> <span word="twice">twice</span> <span word="the">the</span> <span word="diameter">diameter</span> <span word="of">of</span> <span word="Earth">Earth</span> <span word="which">which</span> <span word="are">are</span> <span word="believed">believed</span> <span word="to">to</span> <span word="be">be</span> <span word="in">in</span> <span word="the">the</span> <span word="habitable">habitable</span> <span word="zone">zone</span> <span word="of">of</span> <span word="their">their</span> <span word="parent">parent</span> <span word="stars">stars</span>.</p><p>该发现使直径不到地球两倍、被认为位于它们母恒星可居住带内的小行星数量翻了一倍。</p><p><span word="Among">Among</span> <span word="these">these</span> <span word="eight">eight</span>, <span word="astronomers">astronomers</span> <span word="say">say</span> <span word="there">there</span> <span word="are">are</span> <span word="two">two</span> <span word="that">that</span> <span word="are">are</span> <span word="the">the</span> <span word="most">most</span> <span word="similar">similar</span> <span word="to">to</span> <span word="Earth">Earth</span> <span word="of">of</span> <span word="any">any</span> <span word="known">known</span> <span word="exoplanets">exoplanets</span> <span word="to">to</span> <span word="date">date</span>.</p><p>天文学家说，在这8个行星中，有两个是迄今已知所有外行星中和地球最像的。</p><p>'<span word="Most">Most</span> <span word="of">of</span> <span word="these">these</span> <span word="planets">planets</span> <span word="have">have</span> <span word="a">a</span> <span word="good">good</span> <span word="chance">chance</span> <span word="of">of</span> <span word="being">being</span> <span word="rocky">rocky</span>, <span word="like">like</span> <span word="Earth">Earth</span>,' <span word="said">said</span> <span word="lead">lead</span> <span word="scientist">scientist</span> <span word="Dr">Dr</span> <span word="Guillermo">Guillermo</span> <span word="Torres">Torres</span>, <span word="from">from</span> <span word="the">the</span> <span word="Harvard">Harvard</span>-<span word="Smithsonian">Smithsonian</span> <span word="Centre">Centre</span> <span word="for">for</span> <span word="Astrophysics">Astrophysics</span> <span word="in">in</span> <span word="Cambridge">Cambridge</span>, <span word="US">US</span>.</p><p>美国剑桥大学哈佛-史密森天体物理学中心首席科学家吉列尔莫·托雷斯博士说：“这些行星中的大多数都很可能像地球一样有岩石。”</p><p><span word="The">The</span> <span word="two">two</span> <span word="most">most</span> <span word="Earth">Earth</span>-<span word="like">like</span> <span word="planets">planets</span>, <span word="known">known</span> <span word="as">as</span> <span word="Kepler">Kepler</span>-438<span word="b">b</span> <span word="and">and</span> <span word="Kepler">Kepler</span>-442<span word="b">b</span>, <span word="both">both</span> <span word="orbit">orbit</span> <span word="red">red</span> <span word="dwarf">dwarf</span> <span word="stars">stars</span> <span word="that">that</span> <span word="are">are</span> <span word="smaller">smaller</span> <span word="and">and</span> <span word="cooler">cooler</span> <span word="than">than</span> <span word="the">the</span> <span word="sun">sun</span>.</p><p>那两个最像地球的行星分别是<span word="Kepler">Kepler</span>-438<span word="b">b</span>和<span word="Kepler">Kepler</span>-442<span word="b">b</span>。它们都绕红矮星轨道运行。这些恒星（红矮星）不仅比太阳小，还比太阳冷。</p>
页:
[1]