The comet nucleus itself is too small to hold on to these gases through gravitation.
慧核本身太小，它的引力不足以束缚住这些气体。
For all the fiery display it makes in the sky, the nucleus of a comet is relatively small.
尽管彗星在天空中显得光彩夺目，但彗核相对来说是较小的。
The fan-shaped region that stretches upward from Johnson's nucleus (yellow ball in the middle) represents the dust "tail" of the comet.
从Johnson彗星的彗核（照片中部的黄色球体）向上延展的扇状区域描绘出了这颗彗星的尘埃“尾”。
The fan-shaped region that stretches upward from Johnson's nucleus (yellow ball in the middle) represents the dust "tail" of the comet.
从Johnson彗星的彗核（照片中部的黄色球体）向上延展的扇状区域描绘出了这颗彗星的尘埃“尾”。
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