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class="ss"><div><span>导读： </span>据英国《华闻周刊》报道，瑞士洛桑联邦理工学院(EPFL)的研究人员提出了一种新方法，来解决是否存在外星生命的问题：一种缩小外来信号检测范围的统计模型。这是由EPFL科学家Claudio Grimaldi与加州大学伯克利分校合作 ...</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div> 据英国《华闻周刊》报道，瑞士洛桑联邦理工学院(EPFL)的研究人员提出了一种新方法，来解决是否存在外星生命的问题：一种缩小外来信号检测范围的统计模型。这是由EPFL科学家Claudio Grimaldi与加州大学伯克利分校合作开发的一种统计模型，该模型采用贝叶斯定理，来计算在地球周围给定半径范围内检测信号的概率。</div><div><p style="text-align: center;"><a href="data/attachment/portal/201810/11/101040exb74hdm97xx999a.jpg" target="_blank"><img src="data/attachment/portal/201810/11/101040exb74hdm97xx999a.jpg"></a></p></div><div><br></div><div> 他认为，如果在1000光年的半径范围内没有检测到信号，那么地球仍有至少10%的可能处于来自银河系其他部分的数百个潜在信号的范围内。问题是我们的射电望远镜不够强大，无法探测到它们。</div><div><br></div><div> Grimaldi估计，在离地球40000光年的情况下，探测外星信号的概率变得非常微弱。在那个距离，“我们可以合理地得出结论，在银河系中没有任何与我们技术发展水平相同的其他文明，”他说。</div><div><br></div><div> 然而，到目前为止，科学家们只能在40光年的距离内搜索信号。</div><div><br></div><div> 近60年来，研究人员一直在寻找外星生命的迹象。自20世纪50年代后期以来，已经开展了几项关于寻找外星智能(SETI)的研究项目，主要是在美国。其中包括使用最新的高性能射电望远镜监测电磁辐射的传播迹象。尽管射电天文学和计算能力的提高取得了相当大的进步，但这些项目都没有带来任何具体的结果。</div><div><br></div><div> 到目前为止，科学家已经记录了几个信号，例如1977年被记录下来的“Wow！ Signal”但科学家无法确定其起源。并且没有哪个信号重复出现过。</div><div><br></div><div> 尽管如此，科学家还没有放弃。在我们的太阳系外发现近4000颗行星(系外行星)后，SETI重新受到关注。研究人员还设计了先进的新仪器，如Square Kilometer Array，这是一种在南非和澳大利亚建造的巨型射电望远镜，总收集面积为1平方公里，可以为新突破铺平道路。</div><div><br></div><div><p microsoft="" yahei",="" simsun;="" background-color:="" rgb(255,="" 255,="" 255);="" text-align:="" center;"="" center;="" 255);"="" style="text-align: center; word-wrap: normal; margin: 0px; padding: 0px; color: rgb(143, 143, 143); font-family: Tahoma, "Microsoft Yahei", Simsun; background-color: rgb(255, 255, 255);"><b style="word-wrap: normal;"><font size="5" style="word-wrap: 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</dl><a name="comment_anchor_19933"></a> <dl id="comment_19933_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(19933, '7137');">引用</a> </span> <a href="http://club.oecr.com/space-uid-66058.html" class="xi2 xw1" c="1">fanxingyu</a> <span class="xg1 xw0">2018-10-11 19:39</span> </dt> <dd>不错的内容。</dd> </dl><a name="comment_anchor_19928"></a> <dl id="comment_19928_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(19928, '7137');">引用</a> </span> <a href="http://club.oecr.com/space-uid-14346.html" class="xi2 xw1" c="1">sg_1978</a> <span class="xg1 xw0">2018-10-11 17:39</span> </dt> <dd>光电工程师社区 不错</dd> </dl><a name="comment_anchor_19921"></a> <dl id="comment_19921_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(19921, '7137');">引用</a> </span> <a 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