“玉兔东升”“急如星火”“开天辟地”……这些成语里的“玉兔”“星火”“天地”等，在天文中又代表了什么呢？为什么会“日月无光”？为什么会“银河倒泻”？为什么要用“动如参商”来形容两个人不合呢？在这些成语背后，其实都有息息相关的科学知识，以深入浅出的文字，编写出有趣生动的小故事，同时，也让孩童在故事中，找出这些介绍宇宙生成、各种天体及太空科技的科学知识解答。
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