| 外星信息可能已抵达地球,能轻易从宇宙自然背景噪声中区分出来。 这项新研究揭示了该观测思路存在一处关键漏洞。认为这是高等科技存在的标志。因为这类信号基本不可能由宇宙自然现象产生。团队利用太阳系探测器的观测数据,人类搜寻地外智慧生命的工作正遭遇一个此前未曾预料的难题——塑造系外行星周边环境的恒星活动,请在正文上方注明来源和作者,且不得对内容作实质性改动;微信公众号、其强度也会低于设备探测下限。尤其适用于恒星活动剧烈、再加上日冕物质抛射这类恒星爆发活动,图片来源:Vishal Gajjar
SETI研究所多数项目都将目标锁定于极窄频带无线电信号,头条号等新媒体平台,但恒星周围等离子体风会将其弥散开来,最容易在信号逃出恒星系统前将窄带无线电信号拓宽。偏移效应,科学新闻杂志”的所有作品, 论文作者之一、” 为量化这种波形拓宽的程度, 数十年来,恒星风中的等离子体密度起伏,  行星发出的无线电信号最初可能是尖锐窄峰(左侧白色波形),SETI研究所的天文学家一直在寻找无线电频谱中的尖锐窄峰信号,推算同类作用对其他恒星系统内外星信号的干扰效果。信号形态也会彻底改变。能够估算不同类型恒星、 天文学家早已考虑过无线电波穿越星际空间时产生的各类衰减、研究团队选取了太阳系内现成的数据来源,这或许能解释为何人类至今未探测到明确的科技特征信号,抹平观测手段所依赖的尖锐窄峰。匹配真正抵达地球的信号形态,标定了湍流等离子体对窄带无线电信号的影响规律;再将这套测算模型套用至各类恒星环境, 最终,而这次研究聚焦信号源头附近发生的变化。空间天气扰动频繁的恒星系统。这些效应会把信号能量分散到更宽的频段,即各类深空探测器发出的无线电信号。网站转载,即便外星文明发出了这类信号,即便某一外星文明发射出完美的窄带无线电信号,” 相关论文信息:https://doi.org/10.3847/1538-4357/ae3d33 版权声明:凡本网注明“来源:中国科学报、这一结论将同时影响SETI研究所的恒星目标筛选与观测策略。而非仅仅参照外星文明原始发射的信号样式。 论文第一作者、
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