Earth-like civilizations generate heat from the energy that they utilize. The thermal radiation from this heat can be a thermodynamic marker for civilizations. Here we model such planetary radiation on Earth-like planets and propose a strategy for detecting such an alien unintentional thermodynamic electromagnetic biomarker. We show that astronomical infrared (IR) civilization biomarkers may be detected within an interestingly large cosmic volume using a 70 m-class or larger telescope. In particular, the Colossus telescope with achievable coronagraphic and adaptive optics performance may reveal Earth-like civilizations from visible and IR photometry timeseries’ taken during an exoplanetary orbit period. The detection of an alien heat signature will have far-ranging implications, but even a null result, given 70 m aperture sensitivity, could also have broad social implications.

中文翻译：

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全球变暖作为类地太阳系外文明的可检测热力学标志：像巨像这样的望远镜的案例

类地文明从它们利用的能量中产生热量。这种热量的热辐射可以成为文明的热力学标志。在这里，我们对类地行星上的这种行星辐射进行建模，并提出一种检测这种外星人的策略无意的热力学电磁生物标志物。我们展示了天文红外 (IR)文明生物标志物可以使用 70 m 级或更大的望远镜在一个有趣的大宇宙体积内探测到。特别是，具有可实现日冕和自适应光学性能的 Colossus 望远镜可以从系外行星轨道期间拍摄的可见光和红外光度时间序列中揭示类地文明。外星热信号的检测将产生深远的影响，但即使是零结果，考虑到 70 m 的孔径灵敏度，也可能产生广泛的社会影响。