供职于德国哥根廷马克思普朗克协会进行太阳系研究的霍尔格思科表示，这颗彗星的内部密度仅为水的一半。
The comet's interior, meanwhile, says Holger Sierks of the Max Planck Institute for Solar System Research, in Göttingen, Germany, has only half the density of water.
供职于德国哥根廷马克思普朗克协会进行太阳系研究的霍尔格思科表示，这颗彗星的内部密度仅为水的一半。
The comet's interior, meanwhile, says Holger Sierks of the Max Planck Institute for Solar System Research, in Göttingen, Germany, has only half the density of water.
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