Ghostly Moon 'Fog Bow' Glows Over Finland Lake (Photo)
Thomas Kast sent SPACE.com this photo of a lunar fog bow taken over a lake in Yli-Ii, Finland on Aug. 25.
Credit: © Thomas Kast, All Rights Reserved | Salamapaja

The ethereal light of a lunar fog bow made of moonlight and fog glows over a Finland lake in this beautiful night sky photo. 

Finnish photographer Thomas Kast took this stunning shot on a cold, foggy night around 1 a.m. local time on Aug. 25, from Yli-Ii, Finland.

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"This lake remained clear for a long time. At one point I saw this white bow with the waning gibbous behind me. I had no clue what it was that I saw and started to take pictures," Kast wrote SPACE.com in an email.

Similar to a rainbow, tiny water droplets that cause fog reflect light. Lunar fog bows typically appear white because sunlight reflected from the moon is weak. Some photographers have also captured so-called "moonbows," which are similar to rainbows in that they do include colors.

The lunar fog bows lack of colors is caused by the smaller water drops … so small that the wavelength of light becomes important. Diffraction smears out colors that would be created by larger water drops in rainbows, according to NASA.

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To see more amazing night sky photos submitted by SPACE.com readers, visit our astrophotography archive.

Editor's note: If you have an amazing night sky photo you'd like to share for a possible story or image gallery, please contact managing editor Tariq Malik at spacephotos@space.com.

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