Description: 在天文學中，亮度是指天體發射的電磁輻射量，或是指我們從天體接收到的光量。

“亮度”一詞並不是一個正式的科學術語，但通常用來表示從天體接收到的電磁通量（接收器單位面積在單位時間內接收到的能量，單位：瓦/米²）。“本徵亮度”一詞通常指天體自身的光度（單位：瓦），而“表面亮度”一詞則用於呈延展分布的天體，是指接收器單位面積在單位時間內接收到的天體單位面積的能量（單位：瓦/米²/球面度²，或瓦/米²/弧秒²）。對亮度的這些不同度量，既可以在天體發射的整個電磁波譜上定義，也可以在電磁波譜的特定區域內定義。

出於歷史原因，天文學家使用所謂的星等系統來描述一個天體的亮度，這是一個對數系統，給亮度較高的恆星賦予較小的數值。

亮度的變化可以讓我們重建物理過程，例如，一顆恆星變大變亮，或者一個較暗的天體從一個較亮的天體前面經過。

Related Terms:

• 電磁輻射
• 光度
• Magnitude

Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

This is an automated transliteration of the simplified Chinese translation of this term

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