<span>The dust particles are pushed away by solar radiation, forming a dust tail. Every time a comet passes near the sun, it loses more of its ice, and, eventually, after many passes, the comet may no longer have enough material to form tails. The comet's surface will be covered by dark dust.
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The purpose of imagery in poetry is to help get the poet's message across in language that is strong, vivid and very visual. The poet will use words to create images in our heads that help us to interpret the poem in the way he sees it.