shuǐ水xīng星shì是lí离tài太yáng阳gōng公gōng公zuì最jìn近de的xiǎo小xíng行xīng星。yīn因wèi为lí离huǒ火lú炉zuì最jìn近，tā它bái白tiān天de的dà大dù肚zi子huì会bèi被shài晒dé得chāo超jí级tàng烫，néng能bǎ把qiǎo巧kè克lì力yī一shùn瞬jiān间kǎo烤huà化；dàn但shì是dào到le了yè夜wǎn晚，yóu由yú于shuǐ水xīng星jǐ几hū乎méi没yǒu有dà大qì气céng层dà大bèi被zi子lái来bǎo保wēn温，tā它yòu又huì会biàn变dé得bīng冰tiān天xuě雪dì地、jí极qí其hán寒lěng冷。shuǐ水xīng星biǎo表miàn面bù布mǎn满le了mì密mì密má麻má麻、bèi被yǔn陨shí石zhuàng撞jī击chū出lái来de的dà大shēn深kēng坑，zhǎng长dé得hé和wǒ我men们de的yuè月liàng亮jiě姐jiě姐fēi非cháng常xiàng像。yīn因wèi为shuǐ水xīng星zǒng总shì是duǒ躲zài在tài太yáng阳gōng公gōng公yào耀yǎn眼de的guāng光máng芒lǐ里，wǒ我men们zài在dì地qiú球shàng上yòng用pǔ普tōng通wàng望yuǎn远jìng镜hěn很nán难kàn看qīng清tā它。guò过qù去，kē科xué学jiā家fā发shè射le了lì厉hài害de的“xìn信shǐ使hào号”tàn探cè测qì器，zhuān专mén门fēi飞guò过qù去wéi围zhe着tā它pāi拍le了hǎo好duō多gāo高qīng清zhào照piàn片ne呢！

Mercury is the closest small planet to Grandpa Sun. Being nearest to this giant furnace, its big belly gets super hot during the day, enough to melt a chocolate bar instantly. But at night, because Mercury has almost no coat of atmosphere to trap the heat, it becomes freezing cold. Mercury's surface is covered with countless deep impact craters left by meteorites, looking very much like our sister Moon. Because Mercury always hides near Grandpa Sun's dazzling light, it's very hard for us to see it clearly with regular telescopes from Earth. In the past, scientists launched the amazing 'Messenger' probe to orbit and take many high-definition photos of it!

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你抬头看天空的方式，和今天学的太空知识有什么联系？ How does looking at the sky connect to today's space fact?

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水星的夜晚为什么会变得极其寒冷？

Why does Mercury get extremely cold at night?

💡 想一想刚才读到的内容。 Think about what you just read.