人民教育出版社小学四年级上册《语文》教材第四单元语文园地日积月累部分有一首李商隐的《嫦娥》：“云母屏风烛影深，长河渐落晓星沉。嫦娥应悔偷灵药，碧海青天夜夜心。”
当年我教孩子背这首诗的时候，为了让其更能理解、记忆，我做了一些功课。诗句中的晓星即启明星，也即金星（Venus）。金星在中国古代称为太白、明星或大嚣，早晨出现于东方称启明，晚上出现于西方称长庚。
金星常被称为地球的姊妹星。在太阳系四颗类地行星中，金星的大气层最厚。浓厚的大气层让金星异常炎热，同时更能反射太阳光，这让金星在地球夜空中的亮度仅次于月球，是第二亮的天体。
这部分科普内容来自RAZ S “Our Solar System”：
Venus and Earth are similar in size. But Earth and Venus are very different. Venus is covered by layers of clouds that are much thicker than clouds on Earth. These clouds trap most of the Sun’s heat. The temperature on Venus gets very, very hot-more than four times hotter than boiling water.
As well as trapping in heat, the clouds of Venus reflect sunlight. This makes Venus one of the brightest objects in the sky. The air pressure on Venus is ninety times greater than that on Earth. For this reason, space probes that land on Venus stop working within a few hours. Venus rotates even more slowly than Mercury. One day on Venus is equal to 243 Earth days.
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