A Moonbow!
Have you seen a rainbow at night?
Well to be honest, I have never seen one with my own eyes.
But luckily, a persistent astrophotographer from Kamuela, Hawaii has recorded this spectacular example long after dark:
- Credit: Ethan Tweedie of Kamuela, Hawaii
In this picture, the bright moon played the role of sun, illuminating nightime raindrops falling through the damp Hawaiian air.
This long exposure image also revealed something even more rare: a secondary moonbow. It’s the faint ‘bow arciing above the brighter primary.
Primary rainbows are caused by single reflections inside raindrops; secondary bows are caused by double reflections.
It was a night to remember, indeed. 
Image was originally featured in http://spaceweather.com/
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