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　　北??(bei)京??(jing)天??(tian)文??(wen)館??(guan)的??(de)科??(ke)普??(pu)專??(zhuan)家??(jia)介??(jie)紹??(shao)??，土??(tu)星??(xing)環(huán)??(huan)完??(wan)全??(quan)側(cè)??(ce)對(duì)??(dui)地??(di)球??(qiu)時(shí)??(shi)??，是??(shi)天??(tian)文??(wen)學(xué)??(xue)家??(jia)獲??(huo)得??(de)研??(yan)究??(jiu)環(huán)??(huan)系??(xi)三?(san)維??(wei)結(jié)??(jie)構(gòu)??(gou)的?(de)絕??(jue)佳??(jia)機(jī)??(ji)會(huì)??(hui)??。??微??(wei)弱??(ruo)的??(de)光?(guang)影?(ying)變??(bian)化??(hua)可??(ke)能??(neng)揭?(jie)示??(shi)土??(tu)星?(xing)環(huán)??(huan)塵??(chen)埃??(ai)分?(fen)布??(bu)的??(de)異??(yi)常??(chang)??，這??(zhe)種??(zhong)特??(te)殊??(shu)視??(shi)角??(jiao)帶??(dai)來(lái)??(lai)的??(de)觀??(guan)測(cè)??(ce)窗??(chuang)口??(kou)??，就??(jiu)像?(xiang)為??(wei)宇??(yu)宙??(zhou)CT掃??(sao)描??(miao)打??(da)開??(kai)了??(le)最??(zui)佳??(jia)角??(jiao)度??(du)???！　⊥??(tu)星??(xing)以??(yi)26.7度??(du)的??(de)傾??(qing)角?(jiao)繞??(rao)太??(tai)陽(yáng)??(yang)公??(gong)轉(zhuǎn)??(zhuan)??，當(dāng)??(dang)它?(ta)運(yùn)??(yun)行??(xing)到??(dao)軌??(gui)道?(dao)特??(te)定??(ding)位??(wei)置??(zhi)時(shí)??(shi)??，環(huán)??(huan)平??(ping)面??(mian)恰??(qia)好??(hao)正??(zheng)對(duì)??(dui)太??(tai)陽(yáng)??(yang)??。??此??(ci)時(shí)??(shi)??，陽(yáng)??(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(guò)??(guo)環(huán)??(huan)面??(mian)??，相??(xiang)當(dāng)??(dang)于??(yu)我??(wo)們??(men)側(cè)??(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(méi)??(mei)在??(zai)黑??(hei)暗??(an)背?(bei)景??(jing)中??(zhong)??。。