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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

Moonbow and Rainbows Over Patagonia

Explanation: Have you ever seen a moonbow? Just as rainbows are lit by the Sun , moonbows are lit by the Moon . Since the Sun is so much brighter than the Moon , sunlit rainbows are much brighter and more commonly seen than moonbows. The above movie captures not only a moonbow , but several rainbows, moving clouds, and the starry sky visible in 2009 February over Patagonia in Chile . The slight movement of the rainbows is due to the changing sky position of the Sun. Since moonlight is itself reflected sunlight , the colors are nearly the same. Both rainbows and moonbows are created by light being scattered inside small water droplets, typically from a nearby rainfall. The raindrops each act as miniature prisms , together creating the picturesque spectrum of colors seen.

Date August 10, 2009
Credit Credit & Copyright: Stéphane Guisard (Los Cielos de Chile)
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.