A spectacular moondog formed in the sky over Fairbanks, Alaska, on the evening of March 17, 2003.  A moondog, or paraselene, forms when moonlight combines with ice crystals high in the Earth's atmosphere.  It appears brighter and more colorful than the accompanying ring around the moon because the ice crystals there are probably larger.  The star to the left of the moondog's "tail" is Arcturus, and a faint reddish aurora can be seen behind the cirrus clouds above the moon.