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學習快評丨qibao666888　　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??(shu)水??(shui)冰??(bing)顆??(ke)粒??(li)、巖??(yan)石??(shi)碎??(sui)片??(pian)和??(he)塵??(chen)埃??(ai)構??(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)??。??　　土??(tu)星?(xing)以?(yi)26.7度??(du)的??(de)傾??(qing)角??(jiao)繞??(rao)太??(tai)陽??(yang)公??(gong)轉??(zhuan)??，當??(dang)它??(ta)運??(yun)行??(xing)到??(dao)軌??(gui)道??(dao)特??(te)定??(ding)位??(wei)置??(zhi)時?(shi)??，環(huán)?(huan)平??(ping)面??(mian)恰??(qia)好??(hao)正?(zheng)對??(dui)太??(tai)陽??(yang)??。??此??(ci)時??(shi)??，陽?(yang)光??(guang)以??(yi)不??(bu)足??(zu)1度??(du)的??(de)極??(ji)淺??(qian)角??(jiao)度??(du)掠??(lve)過??(guo)環(huán)??(huan)面??(mian)??，相??(xiang)當??(dang)于??(yu)我??(wo)們??(men)側??(ce)視?(shi)一??(yi)張??(zhang)A4紙??(zhi)的??(de)邊??(bian)緣??(yuan)??，原?(yuan)本??(ben)璀??(cui)璨?(can)的??(de)光??(guang)環(huán)??(huan)便??(bian)隱??(yin)沒??(mei)在?(zai)黑??(hei)暗??(an)背??(bei)景??(jing)中??(zhong)??。。