No credible periodic artificial signals were detected in the first lunar farside SETI observations using Chang'E-4 low-frequency radio spectrometer data.
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Neutral hydrogen absorption adds a frequency-dependent optical depth to the CMB at long radio wavelengths, providing a new probe of x_HI/T_s during the dark ages and reionization.
Simulations using the STARFIRE-2 model indicate that the global redshifted 21-cm signal from the cosmic dawn is detectable from a low-Earth near-polar orbit with a thermal noise limited radiometer.
citing papers explorer
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First Lunar Farside SETI Observations for Periodic Signals with the Low-frequency Radio Spectrometer of Chang'E-4 Mission
No credible periodic artificial signals were detected in the first lunar farside SETI observations using Chang'E-4 low-frequency radio spectrometer data.
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The $\tau$ of Neutral Hydrogen: Increased CMB Optical Depth at Long Wavelengths
Neutral hydrogen absorption adds a frequency-dependent optical depth to the CMB at long radio wavelengths, providing a new probe of x_HI/T_s during the dark ages and reionization.
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STARFIRE-2: Can we detect the global redshifted 21-cm signal from the cosmic dawn in Earth orbit?
Simulations using the STARFIRE-2 model indicate that the global redshifted 21-cm signal from the cosmic dawn is detectable from a low-Earth near-polar orbit with a thermal noise limited radiometer.