宇宙的星星有無限多,那為啥夜晚還是黑的?:－new htc one開箱,htc手機評價,htc手機比較,htc手機遊戲,htc手機維修,htc手機價位,htc手機推薦,htc手機鈴聲,中華電信htc手機,htc手機截圖,亞太htc手機,

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宇宙的星星有無限多,那為啥夜晚還是黑的?

Oct 18th 2013, 11:04

答案因為物體距離跟發光源映射量與光度呈正比

也就是說物體距離發光源越遠發光源可以映照在物體的光量跟光度越少

打個比方在晚上我們打開手電筒可以照到近處但是距離一遠就不清楚了

我們不管是打開探照燈或是汽車霧燈的時候
在周圍或許會很明亮但是距離一拉遠所看見的其實也只是個比較亮的點
那如果在把距離拉長比如從高空上看汽車的光點也就會變小
光度也會變小
再者恆星就算在他周圍是非常光亮沒錯
但是距離一旦拉遠後所到達地球的光度跟光線量就會被削弱到
妳眼睛所見的這樣　

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