Ever since the Second World War, television signals (as well as FM radio and radar) have served as Homo sapiens' emissaries into deep space. High-frequency, high-power broadcasts have filled an Earth-centered bubble more than 60 light-years in radius with signals.

Seth Shostak

Seth Shostak

Bubble Deep Ever Filled Homo More Radar Radio Second Second World War Served Signals Since Space Television Than War Well World World War

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