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TIL about the Degenerate Era, where the stars in our universe will run out of fuel, and the starry night sky we see today will no longer exist. Aging stars and stellar remnants will be too cold to support life. It’s hypothesized to happen about 1 quintillion years after the Big Bang.
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whatilearned
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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.
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whatilearned
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