how bright can a firework be?
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With chemical explosives you can extend the burn duration, but not for very long because it will fall back to Earth quickly Easiest way I can think of to do continuous sky light would be solar panels + LEDs + solar-powered plane or weather balloon
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If you could convince a state to allow it, you could launch a fission reactor into orbit and cover it with LEDs, or just build a big Mylar mirror if that counts
End of conversation
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