Why are bugs attracted to light?

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Why are bugs attracted to light?

In:

Nocturnal bugs fly in a straight line when going somewhere by keeping the moon at the exact same direction. This works because the moon is so far away.

When you keep a light that is much closer in the exact same direction you actually spiral into it.

So long story short they confuse a light with the moon and because of how their navigation skills work they fly into it.

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