Glossary term: 標準燭光
Description: 標準燭光是指發光光度（單位時間內發射的能量）不用考慮距離，可以通過其物理機制可以直接計算的天體，可用來估算天體到地球的距離。
對於大多數天體，天文學家都不知道它們與地球的距離。在這種情況下，很難確定我們看到的是一個遙遠但非常明亮的天體，還是一個較近但不太明亮的天體--從地球上測量的視亮度在兩種情況下可能是一樣的。標準燭光的亮度可以在不知道其距離的情況下估算出來。然後，通過比較光度和天體在夜空中的視亮度，就可以計算出標準燭光的距離。重要的例子包括造父變星（一類存在脈動週期與光度之間關係的脈動恆星）和Ia型超新星（一類明亮的恆星爆炸，其最大光度與隨後亮度下降的時間尺度之間存在關係）。
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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
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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astroEDU educational activity (links to astroEDU website) Description: Understand astronomical distances using street lightsLicense: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
Tags: Hands-on , Distances , Distance measurements , Inverse square law Age Ranges: 14-16 , 16-19 , 19+ Education Level: Informal , Secondary , University Areas of Learning: Modelling , Structured-inquiry learning , Technology-based Costs: Low Cost Duration: 3 hours Group Size: Group Skills: Analysing and interpreting data , Constructing explanations , Developing and using models , Planning and carrying out investigations , Using mathematics and computational thinking
