NASA发现“超级地球” 或存在生命
<p>近日，美国宇航局的过境系外行星测量卫星发现“超级地球”，距离地球31光年，位于宜居区，与其他行星一起绕恒星运行。科学家称，如果该星球存在稠密大气层，则极可能像地球一样表面可留存液态水，具有类似地球的宜居条件。</p><p><span word="After">After</span> <span word="completing">completing</span> <span word="its">its</span> <span word="first">first</span> <span word="year">year</span> <span word="of">of</span> <span word="observations">observations</span> <span word="in">in</span> <span word="the">the</span> <span word="southern">southern</span> <span word="sky">sky</span>, <span word="NASA">NASA</span>'<span word="s">s</span> <span word="Transiting">Transiting</span> <span word="Exoplanet">Exoplanet</span> <span word="Survey">Survey</span> <span word="Satellite">Satellite</span> <span word="has">has</span> <span word="spotted">spotted</span> <span word="some">some</span> <span word="intriguing">intriguing</span> <span word="new">new</span> <span word="exoplanets">exoplanets</span> <span word="only">only</span> 31 <span word="light">light</span>-<span word="years">years</span> <span word="away">away</span> <span word="from">from</span> <span word="Earth">Earth</span>.</p><p>美国宇航局的过境系外行星测量卫星（<span word="TESS">TESS</span>）在完成对南半球天空的第一年观测后，发现了几颗距离地球仅31光年的有趣的新系外行星。</p><p><span word="exoplanet">exoplanet</span>[,<span word="eks">eks</span>əʊ'<span word="pl">pl</span>æ<span word="n">n</span>ɪ<span word="t">t</span>]：<span word="n">n</span>.系外行星</p><p><span word="Multiple">Multiple</span> <span word="exoplanets">exoplanets</span> -- <span word="planets">planets</span> <span word="orbiting">orbiting</span> <span word="stars">stars</span> <span word="outside">outside</span> <span word="our">our</span> <span word="solar">solar</span> <span word="system">system</span> -- <span word="were">were</span> <span word="discovered">discovered</span> <span word="orbiting">orbiting</span> <span word="an">an</span> <span word="M">M</span>-<span word="dwarf">dwarf</span> <span word="star">star</span>, <span word="called">called</span> <span word="GJ">GJ</span> 357 <span word="in">in</span> <span word="the">the</span> <span word="Hydra">Hydra</span> <span word="constellation">constellation</span>. <span word="The">The</span> <span word="star">star</span> <span word="is">is</span> 40% <span word="cooler">cooler</span> <span word="than">than</span> <span word="our">our</span> <span word="sun">sun</span> <span word="and">and</span> <span word="only">only</span> <span word="about">about</span> <span word="a">a</span> <span word="third">third</span> <span word="of">of</span> <span word="the">the</span> <span word="sun">sun</span>'<span word="s">s</span> <span word="mass">mass</span> <span word="and">and</span> <span word="size">size</span>. <span word="A">A</span> <span word="study">study</span> <span word="describing">describing</span> <span word="the">the</span> <span word="three">three</span> <span word="planets">planets</span> <span word="was">was</span> <span word="published">published</span> <span word="this">this</span> <span word="week">week</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Astronomy">Astronomy</span> & <span word="Astrophysics">Astrophysics</span>.</p><p>科学家发现了数颗围绕着长蛇座<span word="M">M</span>矮星<span word="GJ">GJ</span> 357运行的系外行星，系外行星指的是围绕太阳系外恒星运行的行星。这颗恒星的温度比太阳低40%，质量和体积只有太阳的三分之一左右。一项描述这三颗行星的研究本周发表在《天文学与天体物理学》期刊上。</p><p><span word="constellation">constellation</span> [,<span word="k">k</span>ɒ<span word="nst">nst</span>ə'<span word="le">le</span>ɪʃ(ə)<span word="n">n</span>]：<span word="n">n</span>.星座；星群</p>
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