当彗星接近太阳时,它表面的冰壳开始融化分解成大大小小的碎片,大多数碎片并不会比沙粒更大。
When a comet gets close to the sun, melting ice releases pieces of dust, most no larger than grains of sand.
当彗星接近太阳时,它表面的冰壳开始融化分解成大大小小的碎片,大多数碎片并不会比沙粒更大。
When a comet gets close to the sun, melting ice releases pieces of dust, most no larger than grains of sand.
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