彗星 (huìxīng) means "comet." It refers to the icy celestial objects that develop a visible tail when they pass close to the sun. The character 彗 relates to a broom shape, reflecting the comet's tail.
今晚用望远镜可以看到一颗明亮的彗星。
Jīn wǎn yòng wàngyuǎnjìng kěyǐ kàn dào yī kē míngliàng de huìxīng.
Tonight you can see a bright comet with a telescope.
彗星靠近太阳时会出现长长的尾巴。
Huìxīng kàojìn tàiyáng shí huì chūxiàn chángcháng de wěiba.
When a comet approaches the sun, it develops a long tail.
哈雷彗星大约每七十六年经过地球一次。
Hāléi huìxīng dàyuē měi qīshíliù nián jīngguò dìqiú yī cì.
Halley's Comet passes by Earth approximately once every seventy-six years.