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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.

See Explanation. Clicking on the picture will download the highest resolution version available.

Mars and a Colorful Lunar Fog Bow

Explanation: Even from the top of a volcanic crater, this vista was unusual. For one reason, Mars was dazzlingly bright two weeks ago, when this picture was taken, as it was nearing its brightest time of the entire year. Mars , on the far upper left, is the brightest object in the above picture. The brightness of the red planet peaked last week near when Mars reached opposition , the time when Earth and Mars are closest together in their orbits. Arching across the lower part of the image is a rare lunar fog bow . Unlike a more commonly seen rainbow , which is created by sunlight reflected prism atically by falling rain, this fog bow was created by moonlight reflected by the small water drops that compose fog . Although most fog bows appear white, all of the colors of the rainbow were somehow visible here. The above image was taken from high atop Haleakala , a huge volcano in Hawaii , USA .

Date February 2, 2010
Credit Credit & Copyright: Wally Pacholka (AstroPics.com, TWAN )
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.