向背离太阳方向延伸的彗尾中较为短、弯、粗的一支。
从太阳而来的辐射，将尘埃粒子吹离彗发，形成尘埃彗尾；同时，来自太阳的带电粒子将一些彗星气体电离成离子，形成离子彗尾。
Radiation from the sun pushes dust particles away from the coma, forming a dust tail, while charged particles from the sun convert some of the comet's gases into ions, forming an ion tail.
彗星每次接近太阳时，都会将一部分冰和尘埃遗留在彗尾的遗迹中。
Comets lose ice and dust each time they come near the sun, leaving behind trails of debris.
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