On the inbound leg of the trip past comet Hartley 2, the Deep Impact spacecraft saw water ice on the surface of the comet. The presence of water ice is suggested in an enhanced color High Resolution Instrument (HRI) image, left panel, along the morning edge of the nucleus. The blue color is indicative of ice. In the middle HRI image, bright rough terrain can be seen. In the right panel, a map of the amount and location of water ice on the large lobe of the nucleus, estimated from spectral data, is overlaid on an HRI visible image to show the collocation of water ice with the bright rough terrain. Blue indicates ice concentrations while pink indicates a warm, dusty nucleus with no ice. Spectroscopic data at this resolution of the small lobe do not exist. Credit: J. Sunshine et al.
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