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汉语拼音：huì wěi

1.一颗彗星的明亮的尾部延伸部分，可以是彗头的扩展或者具有某种结构，因而能与彗头有所区别；彗尾主要由气体和尘埃组成。

2.彗星的尾巴，尤其对亮度或形状而言。

彗尾 [huì wěi]

1. 彗星的尾巴部分。主要受太阳风的吹拂而形成，其长短随绕日轨道而变，行近太阳时，为最长之时，可达数千万公里。

• Because of its angle of approach, Lulin appeared to have a second anti-tail pointing toward the sun as it neared Earth.

  由于靠近时的角度，鹿林彗星在逐渐接近地球时似乎拥有另一条指向太阳的反彗尾。

• Since comet tails are shaped by sunlight and the solar wind, they always point away from the sun.

  由于彗尾是因为太阳光和太阳风成形的，所以彗尾一般背向太阳。

• This radiation pressure is thought to shape the tails of comets and is useful for pushing solar sails in space.

  这种辐射压力被认为是彗尾形成的原因。另外，它也是太阳帆在太空中前进的动力来源。

• The bright meteor was spotted across the UK, leaving a vivid green trail.

  一颗闪亮的彗星在英国被目击，留下了一条亮绿色的彗尾。

• What's more, visible were bright but extremely rare filamentary striae from the comet's expansive dust tail.

  更有甚的是，人们还能看到由彗尾展开的明亮但又极度罕见的丝状细纹。

• Comet tails are millions of kilometers long.

  彗尾的长度可达数百万公里。

• Halley's comet is extremely bright and has two tails. Its latest return was in 1986.

  璀璨明亮的哈雷彗星有两条彗尾，最近一次回归是在1986年。

• In 1910, it seemed that Earth would pass through the tail of Halley's Comet. Many people were afraid the world would come to an end.

  举例来说，科学家预测在西元1910年，地球会通过哈雷彗星的彗尾，许多人因而惶死不已，深怕那是世界末日。

• Generated tail stretching millions of miles

  产生绵延数百万英里的彗尾