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Stars.

Some living organisms (fireflys, etc)

Sorry - I thought that was "what"

As for why - 1) if an object's temperature gets high enough then the escaping (heat) energy "glows" ... thus stars, volcanoes, etc.

2) some biochemical reactions produce a glow (with little or no heat) ...

the why bother varies, to hunt (like a flashlight), to lure (act as bait), to sexually attract a mate.

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12y ago

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