银河系
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(银(yín )河(hé )系(xì ),银(yín )河(hé )系(xì ))
宇(yǔ )宙(zhòu )中(zhōng )的(de )一(yī )个(gè )大(dà )的(de )恒(héng )星(xīng )系(xì ),由(yóu )一(yī )千(qiān )亿(yì )颗(kē )以(yǐ )上(shàng )的(de )大(dà )小(xiǎo )恒(héng )星(xīng )和(hé )无(wú )数(shù )星(xīng )云(yún )、星(xīng )团(tuán )构(gòu )成(chéng ),形(xíng )状(zhuàng )像(xiàng )怀(huái )錶(biǎo ),中(zhōng )心(xīn )厚(hòu ),直(zhí )径(jìng )为(wéi )十(shí )万(wàn )光(guāng )年(nián )。太(tài )阳(yáng )是(shì )银(yín )河(hé )系(xì )中(zhōng )的(de )许(xǔ )多(duō )恒(héng )星(xīng )之(zhī )一(yī ),距(jù )离(lí )银(yín )河(hé )中(zhōng )心(xīn )约(yuē )有(yǒu )三(sān )万(wàn )光(guāng )年(nián )。我(wǒ )们(men )平(píng )常(cháng )在(zài )夜(yè )晚(wǎn )看(kàn )到(dào )的(de )天(tiān )空(kōng )的(de )银(yín )河(hé ),就(jiù )是(shì )银(yín )河(hé )系(xì )的(de )密(mì )集(jí )部(bù )分(fèn )在(zài )天(tiān )球(qiú )上(shàng )的(de )投(tóu )影(yǐng )。
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