TIL that radios can pick up AM signals from stations broadcasting from beyond the horizon because the signals are reflected in the Heaviside Layer, a layer of ionised gas in the Earth’s atmosphere, about 60-90 miles up. The Heaviside Layer acts like a mirror in the sky for radio waves.

Read more: https://en.wikipedia.org/wiki/Kennelly%E2%80%93Heaviside_layer

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