... The Colors of Comet Hyakutake . ... The colors of Comet Hyakutake are caused by the action of sunlight on the dust and gas produced by the warming nucleus. ... NASA's Hubble Space Telescope captured this image of the near-nuclear region of Comet Hyakutake on March 25 as the comet approached within 9.3 million miles of the Earth. ... 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. ...