In large objects like Halley's Comet the nucleus is measured in kilometres.

而别的彗星的彗核比如哈雷慧星的彗核要用千米来计算.

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Comet tails are millions of kilometers long.

彗尾的长度可达数百万公里.

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This spectacular composite image shows how the coma and tail of Comet Holmes have changed.

这张壮观的组合影像显示霍姆斯彗星的彗发与彗尾的变化情形.

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There is a different spherochromatism after the two systems secondary spectrum , spherical aberration and somatic aberration.

当这两种系统消球差、彗差及复消色差后会产生不同的色球差.

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The head of the comet remains quite bright and easily visible city observers without any aide.

彗星的彗核仍然非常明亮,因此不需藉助任何设备,用肉眼就可以看到.

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By using MTT assay and Comet assay effectstem cells on damaged spinal cord neurons was studied.

结果MTT比色试验表明实验组神经元活力明显高于对照组,彗星试验表明实验组拖尾率和彗尾长度均低于对照组.

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The supposed nucleus of the comet is the bright centre of the coma.

预想的彗核是明亮的慧发中心.

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The Sudbury fullerenes contained helium with compositions similar to some meteorites and cosmic dust.

索德柏立富勒烯里的氦气同位素组成,与某些陨石、彗尘中的一样.

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