SUMMARY: When NASA's Deep Impact spacecraft smashed into Comet Tempel 1 last summer, it helped reveal just what's inside a comet. The spacecraft also photographed three distinct patches of water ice on the surface of the comet. While Tempel 1 has a surface area of about 116 square kilometres (45 square miles), these patches of ice only cover about 6% of the comet's surface. It appears that the comet's jets were once inside, but slowly became uncovered over time.
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