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21.
David Jewitt 《Earth, Moon, and Planets》1996,72(1-3):185-201
We discuss the essential differences between comets and asteroids. Ironically, with the exception of the rocky asteroids in the inner solar system, most of the objects classified as asteroids at and beyond Jupiter's orbit are likely to conceal buried volatiles, and thus are more usefully considered as comets. 相似文献