APAS 1110 Summer 1996
Cool Image of the Day -- June 24
Voyager 1 took this picture of Io on March 4, 1979. The brown, orange areas are probably covered by sulphur or a mixture containing sulphur. The light areas may be sulphur dioxide snow and the pock-marks are mostly volcanic calderas up to 200 kilometers (124 miles) across. Mountainous regions exist near both poles, with some features rising 8 kilometers (5 miles) or more above their surroundings. (Credit: Calvin J. Hamilton, and NASA)
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