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It is for my book: i need some material, what would burn very bright for a long time, what could it be? Or another advises, how could a character fake a fireball, seen in the sky for a long time?

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Catch a bunch of fireflies and fill a transparent balloon with them and a mixture of helium and oxygen.

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    $\begingroup$ Innovative, I like it. $\endgroup$ – orthocresol May 5 '16 at 19:26

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