Learn about comets in this interactive activity from NASA. An overview video describes the composition of comets and explains how they may have transported materials (including water) to early Earth and played a role in the development of life. Animations detail the anatomy and life cycle of a comet. Images and text provide information about the specific characteristics of several comets (comet 19P/Borrelly, comet Wild 2, comet Tempel 1, comet 67P, and comet Hartley 2) and the missions to explore them.
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