NASA：其实我们没有发现水......
<p>我们发现的不是水，是水留下的痕迹。</p><p><span word="Water">Water</span> <span word="trickles">trickles</span> <span word="down">down</span> <span word="gullies">gullies</span> <span word="and">and</span> <span word="crater">crater</span> <span word="walls">walls</span> <span word="on">on</span> <span word="the">the</span> <span word="surface">surface</span> <span word="of">of</span> <span word="Mars">Mars</span>, <span word="raising">raising</span> <span word="intriguing">intriguing</span> <span word="questions">questions</span> <span word="about">about</span> <span word="whether">whether</span> <span word="life">life</span> <span word="could">could</span> <span word="exist">exist</span> <span word="on">on</span> <span word="the">the</span> <span word="red">red</span> <span word="planet">planet</span>.</p><p>水流沿着火星表面的火山口壁和山壑流淌而留下的痕迹，又一次将“火星上是不是有生命存在”这一问题抛了出来。</p><p><span word="The">The</span> <span word="findings">findings</span> <span word="are">are</span> <span word="the">the</span> <span word="strongest">strongest</span> <span word="evidence">evidence</span> <span word="yet">yet</span> <span word="that">that</span> <span word="liquid">liquid</span> <span word="water">water</span> <span word="darkens">darkens</span> <span word="the">the</span> <span word="Martian">Martian</span> <span word="surface">surface</span> <span word="today">today</span>; <span word="we">we</span>'<span word="ve">ve</span> <span word="known">known</span> <span word="for">for</span> <span word="years">years</span> <span word="that">that</span> <span word="water">water</span> <span word="flowed">flowed</span> <span word="on">on</span> <span word="Mars">Mars</span> <span word="long">long</span> <span word="ago">ago</span>.</p><p>如今，这一发现是证明液态水使火星表面变得暗沉的最有利证据。其实，多年前我们就知道，很久以前火星上是有水存在的。</p><p><span word="Described">Described</span> <span word="Monday">Monday</span> <span word="in">in</span> <span word="Nature">Nature</span> <span word="Geoscience">Geoscience</span>, <span word="the">the</span> <span word="observations">observations</span> <span word="suggest">suggest</span> <span word="that">that</span> <span word="this">this</span> <span word="water">water</span> <span word="appears">appears</span> <span word="seasonally">seasonally</span>, <span word="forming">forming</span> <span word="dark">dark</span> <span word="lines">lines</span> <span word="as">as</span> <span word="it">it</span> <span word="tumbles">tumbles</span> <span word="down">down</span> <span word="steep">steep</span> <span word="Martian">Martian</span> <span word="slopes">slopes</span>. <span word="But">But</span> <span word="scientists">scientists</span> <span word="still">still</span> <span word="don">don</span>’<span word="t">t</span> <span word="know">know</span> <span word="where">where</span> <span word="the">the</span> <span word="water">water</span> <span word="is">is</span> <span word="coming">coming</span> <span word="from">from</span>, <span word="or">or</span> <span word="if">if</span> <span word="the">the</span> <span word="chemistry">chemistry</span> <span word="is">is</span> <span word="even">even</span> <span word="right">right</span> <span word="for">for</span> <span word="supporting">supporting</span> <span word="life">life</span>.</p><p>《自然地球科学》星期一发布的文章中称，这一发现表明这些水迹的出现是季节性的，水沿着陡峭的火星山壁一泻而下，形成了许多深色的水流线条。但是科学家还是不知道水源在哪，或这一化学物是否能够维持生命。</p><p><span word="For">For</span> <span word="now">now</span>, <span word="the">the</span> <span word="find">find</span> <span word="solves">solves</span> <span word="the">the</span> <span word="mystery">mystery</span> <span word="of">of</span> <span word="dark">dark</span> <span word="streaks">streaks</span> <span word="that">that</span> <span word="appear">appear</span> <span word="and">and</span> <span word="disappear">disappear</span> <span word="seasonally">seasonally</span>, <span word="called">called</span> <span word="recurring">recurring</span> <span word="slope">slope</span> <span word="lineae">lineae</span>.</p><p>目前，这一发现解释了为什么火星表面总会季节性出现或消失深色线纹，这种线段的学名叫做“季节性斜坡纹线”。</p>
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