Astronomy Picture of the Day . ... The above true-color photo taken March 25th shows Comet Hyakutake passing below the stars of the Big Dipper. ... The tail of comet Hyakutake, visible in this recent color image, is composed of dust and gas driven off the icy comet nucleus by the Sun's heat and blown away by the solar wind. ... This March 19th false-color picture of Comet Hyakutake from one of the most sophisticated ground based telescopes captures the area surrounding the comet's nucleus. ... March . ...