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艺术家绘制的系外行星K2155d的概念图。
的FAST射电望远镜曾探测到来自这颗超级地球方向的一个引人关注的无线电信号。
这是外星人的无线电信号吗?图片由NASA提供。
天眼FAST射电望远镜是否探测到了外星无线电波信号? 这个窄带无线电波信号来自超级地球系外行星K2155d的方向,距离地球238光年。
该信号符合一些外星信号的标准,但其他细节让科学家认为它很可能是地球上的无线电干扰。

外星无线电波信号来自K2155d?
科学家们多年来一直在寻找外星文明存在的证据,这一探索活动统称为地外智慧生命搜寻计划(SETI)。
近年来,的五百米口径球面射电望远镜(FAST)也参与其中。
在最近的一项研究中,科研人员利用FAST对33个行星系统进行观测时,发现了一些值得关注的现象。

他们宣布,FAST探测到来自行星系统K2155方向的一个窄带无线电信号,该系统距离地球238光年。

该系统中包含一颗超级地球类型的系外行星K2155d,它可能具备宜居条件。
这颗行星围绕一颗红矮星运行,其半径是地球的1.6倍。
当然,目前我们对这颗行星的了解还不足以对其是否适合生命起源做出明确判断。
FAST实际上最早在2021年就探测到了该信号,但当时并未被注意到。
研究团队后来利用一种新的基于机器学习的搜索流程对数据进行了重新分析。
该流程旨在更有效地将真实候选信号与来自地球的无线电干扰区分开来。

这些引人入胜的同行评审研究成果已发表于《天文学杂志》。
筛选候选人
该调查最初筛选出139,127个候选信号。
随后,这些候选信号被逐步缩小至两个最具潜力的目标。
其中来自开普勒438恒星方向的一个目标,最终被确认为地球上的无线电干扰。
假设我们receivedthefollowingEnglishsentence"ThatleftK2155." TotranslatethisintoChinese,weneedtoconsiderthecontextandensurethatthetranslationisaccurateandappropriate.Sincethesentencedoesnotprovideanyspecificcontextoradditionalinformation,wecanassumeitisasimplestatementaboutaproductorevent. Letsbreakitdownstepbystep 1.Identifythemaincomponentsofthesentence "That"referstoaspecificitemorevent. "left"indicatestheremainingorremaining. "K2155"isacodeorreferencenumber. 2.TranslateeachcomponentintoChinese "That"canbetranslatedas"这"(this). "left"canbetranslatedas"剩下的"(remaining). "K2155"canbetranslatedas"K2155"(K2155). 3.Combinethetranslatedcomponentsintoacoherentsentence "这剩下的K2155." Therefore,thetranslationof"ThatleftK2155"intoChineseis \boxed{这剩下的K2155}

放大查看。
K2155d与地球的大小对比(艺术家概念图)。
图像来源:MartinVargicHalcyonMapsWikimediaCommons。
为外星无线电信号勾选各项条件
该信号频率为1148.4167兆赫,来自K2155方向——这是一颗距离地球238光年的红矮星。
初步分析表明,该信号通过了天文学家用于甄别其性质的一系列标准检验,即判断它是否属于宇宙中自然产生的射电辐射、地球本地的无线电干扰,抑或可能源于地外智慧生命的信号。

新的机器学习算法采用一种名为小波分析的数学技术,从小波分析中提取出其他嘈杂的无线电数据中的微弱信号。
研究人员最初注意到该信号非常窄。
自然界中很少有源能产生窄带信号,这类信号通常源于人工。
论文指出:
自然天体物理过程很少产生极窄的谱线特征,而人工发射器则常常会产生。
另一个可能的线索是该信号存在频率漂移现象。
这是因为行星在自转并围绕其宿主恒星公转时,其相对运动会通过多普勒效应改变无线电信号的频率,从而导致信号频率随时间发生特征性的漂移。
K2155方向探测到的信号确实表现出这种漂移特征。
不过,地面干扰有时会模拟这种漂移现象。
另一个问题是信号在天空中的位置。
理想情况下,信号应仅出现在一个固定位置。
如果信号出现在多个位置,则很可能是地面干扰所致。
K2155方向的信号仅出现在一个位置,这进一步支持了其可能源自地外文明的推测。

FAST射电望远镜外观图。
图片来源:SCJiangWikimediaCommons。
我查看了数据,结果看起来像是地面干扰:天文学家对33个行星系统开展了地外文明信号搜寻工作,其中一个信号引起了他们的注意。
地球起源的可能性更大
所有这些迹象都曾让K2155信号显得很有希望。
但还有一个问题,它仅在望远镜的一个偏振通道中明显。
此外,在其他三颗恒星上也出现了频率相近的类似信号。
这使得地面干扰成为更可能的来源。
然而,研究人员尚不清楚其具体成因。
目前,该信号的来源仍不明。
它会不会是外星文明发出的呢?或许吧。
但遗憾的是,现有的证据似乎并不支持这一推测。
底线:天眼射电望远镜是否探测到来自超级地球系外行星K2155d的外星无线电波?很可能没有。
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BY: Paul Scott Anderson
FY: AI
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