They are now seen as "icy dirtballs", dominated by rock, in contrast to the "dirty snowballs" hypothesised by Fred Whipple, an astronomer at Harvard University, in 1950.
现在彗星被认为是一个主要由岩石构成的冰冷的土球。 而不是1950年哈佛大学天文学家Fred Whipple假设的盖着土的冰球。
They are now seen as "icy dirtballs", dominated by rock, in contrast to the "dirty snowballs" hypothesised by Fred Whipple, an astronomer at Harvard University, in 1950.
现在彗星被认为是一个主要由岩石构成的冰冷的土球。 而不是1950年哈佛大学天文学家Fred Whipple假设的盖着土的冰球。
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