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學習快評丨qibao666888　　但??(dan)是??(shi)對??(dui)于??(yu)普??(pu)通??(tong)人?(ren)來??(lai)說??(shuo)??，不??(bu)能??(neng)盲??(mang)目??(mu)開??(kai)展??(zhan)觀??(guan)測??(ce)活??(huo)動?(dong)??，因??(yin)為??(wei)這??(zhe)個??(ge)時??(shi)間??(jian)段??(duan)土??(tu)星??(xing)與??(yu)太??(tai)陽??(yang)的??(de)距??(ju)離??(li)太??(tai)近??(jin)??，沒??(mei)有??(you)專??(zhuan)業(yè)??(ye)人??(ren)員??(yuan)指??(zhi)導??(dao)??，一??(yi)般??(ban)不??(bu)容??(rong)易??(yi)找??(zhao)到??(dao)??，還??(hai)有??(you)可??(ke)能??(neng)發(fā)??(fa)生??(sheng)太??(tai)陽??(yang)光??(guang)灼?(zhuo)傷?(shang)眼??(yan)睛??(jing)的??(de)危?(wei)險??(xian)??。??　　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)？??。