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Whipple came up with the "dirty snowball" concept of comets; that the head of the comet is primarily ice and frozen gasses bound together by dust, gravel and rocks. This explains the nature of the "tail" of the comet; as the frozen gasses sublimate away (change from solid to gas, without an intervening liquid state) the gas is carried away by the solar wind and by pressure of the sunlight itself.
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When and by whom was Vegemite invented?
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Who is Dr. Whipple?
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