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Astronomy

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Earth's Shrinking Radio Signature: Why the Alien-Hearing-Our-TV Trope Is Outdated

The science-fiction idea that alien civilizations are passively eavesdropping on decades-old Earth television exaggerates the strength and persistence of our leakage; Earth's incidental radio signature has actually been declining since around 2000.

Why a Lunar Listener Could Detect Faint Earth Radio Signals

A receiver on the Moon enjoys a 20-40 dB lower noise floor than any Earth-based station, and with directional antennas, long integration, and pattern matching it could detect even faint or accidental human radio activity from Earth.

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