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學習快評丨qibao666888　　土??(tu)星??(xing)環(huán)?(huan)這??(zhe)個??(ge)“大??(da)圓??(yuan)環(huán)??(huan)”的??(de)直??(zhi)徑??(jing)大??(da)約??(yue)是??(shi)28萬??(wan)公??(gong)里??(li)??，相??(xiang)當??(dang)于??(yu)地??(di)月??(yue)距??(ju)離??(li)的??(de)三??(san)分??(fen)之??(zhi)二??(er)??，但??(dan)是??(shi)土??(tu)星??(xing)環(huán)??(huan)的??(de)平??(ping)均??(jun)垂??(chui)直??(zhi)厚??(hou)度??(du)卻??(que)只??(zhi)有??(you)10米??(mi)左??(zuo)右??(you)??。??所??(suo)以??(yi)說??(shuo)??，土??(tu)星??(xing)的??(de)光??(guang)環(huán)??(huan)“薄??(bo)如??(ru)蟬??(chan)翼??(yi)”??，那??(na)它??(ta)是??(shi)由??(you)什??(shen)么??(me)組??(zu)成?(cheng)的??(de)呢??(ne)？??　　明??(ming)天??(tian)(24日?(ri))凌??(ling)晨??(chen)?，太??(tai)陽??(yang)系??(xi)八??(ba)大??(da)行??(xing)星??(xing)之??(zhi)一??(yi)的??(de)土??(tu)星??(xing)?，將??(jiang)上?(shang)演??(yan)神??(shen)奇??(qi)的??(de)光??(guang)環(huán)??(huan)“消??(xiao)失??(shi)術??(shu)”??。??我??(wo)們??(men)原??(yuan)來??(lai)看??(kan)到?(dao)的??(de)土??(tu)星??(xing)?，周??(zhou)圍??(wei)有??(you)一??(yi)圈??(quan)漂??(piao)亮??(liang)的??(de)光??(guang)環(huán)??(huan)?，所??(suo)以??(yi)它??(ta)也??(ye)被??(bei)稱??(cheng)為??(wei)“指??(zhi)環(huán)??(huan)王??(wang)”或??(huo)者??(zhe)是??(shi)“草??(cao)帽?(mao)星??(xing)”??。但??(dan)明??(ming)天??(tian)凌??(ling)晨??(chen)?，這??(zhe)個??(ge)光??(guang)環(huán)??(huan)在??(zai)地??(di)球??(qiu)觀??(guan)測??(ce)者??(zhe)的??(de)視?(shi)野??(ye)中??(zhong)就?(jiu)要??(yao)“消??(xiao)失??(shi)”了??(le)?，這??(zhe)是??(shi)怎??(zen)么??(me)回??(hui)事??(shi)呢??(ne)？?。