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學習快評丨qibao666888　　而??(er)且??(qie)這??(zhe)些??(xie)環(huán)??(huan)粒?(li)以??(yi)不??(bu)同??(tong)軌??(gui)道??(dao)繞??(rao)土??(tu)星??(xing)旋??(xuan)轉(zhuǎn)??(zhuan)??，形??(xing)成??(cheng)了?(le)從??(cong)內(nèi)??(nei)到?(dao)外??(wai)的??(de)D、C、B、A、F、G、E七??(qi)個?(ge)主??(zhu)環(huán)??(huan)??，其??(qi)中??(zhong)B環(huán)?(huan)最??(zui)寬??(kuan)最??(zui)亮??(liang)??。??　　北?(bei)京??(jing)天??(tian)文?(wen)館??(guan)的??(de)科??(ke)普?(pu)專??(zhuan)家??(jia)介??(jie)紹??(shao)??，看?(kan)上??(shang)去??(qu)美??(mei)麗??(li)的??(de)土??(tu)星??(xing)光??(guang)環(huán)?(huan)??，實??(shi)際??(ji)上??(shang)是??(shi)由??(you)無??(wu)數(shù)??(shu)水??(shui)冰??(bing)顆??(ke)粒??(li)、巖??(yan)石??(shi)碎??(sui)片??(pian)和??(he)塵??(chen)埃??(ai)構(gòu)??(gou)成??(cheng)??，規(guī)??(gui)模??(mo)超??(chao)級??(ji)龐??(pang)大??(da)??，但??(dan)是??(shi)厚??(hou)度??(du)有??(you)的??(de)地??(di)方??(fang)是??(shi)摩??(mo)天??(tian)大??(da)樓??(lou)??，有??(you)的?(de)地??(di)方??(fang)卻??(que)只??(zhi)有??(you)平??(ping)房??(fang)那??(na)么??(me)高??(gao)??，平??(ping)均??(jun)下??(xia)來??(lai)也??(ye)就??(jiu)十??(shi)多??(duo)米??(mi)??。??。