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With a molten core I'd be surprised if the earth didn't emit it's own light.

Anything with a positive temperature radiates photons. The Earth probably does in the infrared spectrum.

Haha, it would be a shock if it didn’t. That whole “black body radiation” thing.

And we are imaging the Earth in infrared. Well, infrared from non-geologic sources, but oh man are we sure imaging in infrared.

Precisely why I said "(okay, if you are near enough, shielded from the Sun, and looking in infrared, if you like splitting hairs)" ...