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Look down at night. Is the Earth glowing? No. It's basically a big ball of iron with soil on it. Some of the middle is molten, but not enough to give off light.

Look up during the day- right at the sun. Notice how the ridiculous amount of light is blinding you? That's because the enormous ball of nuclear fire in the sky is giving off light. The earth glows in the infrared just a little bit, even when the sun's light is not reflecting off the day side. This is due, in part, to the slow decay of long lived isotopes at the core, and the gradual escape of heat from the nuclear decay of similar isotopes scattered through earth's mantle and core. Earth also glows just a bit in other parts of the electromagnetic spectrum, from radio and television broadcasts, radar, and so on. Again, this glow is very slight.

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16y ago

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