Glossary term: 标准烛光
Description: 标准烛光是指发光光度（单位时间内发射的能量）不用考虑距离，可以通过其物理机制可以直接计算的天体，可用来估算天体到地球的距离。
对于大多数天体，天文学家都不知道它们与地球的距离。在这种情况下，很难确定我们看到的是一个遥远但非常明亮的天体，还是一个较近但不太明亮的天体--从地球上测量的视亮度在两种情况下可能是一样的。标准烛光的亮度可以在不知道其距离的情况下估算出来。然后，通过比较光度和天体在夜空中的视亮度，就可以计算出标准烛光的距离。重要的例子包括造父变星（一类存在脉动周期与光度之间关系的脉动恒星）和Ia型超新星（一类明亮的恒星爆炸，其最大光度与随后亮度下降的时间尺度之间存在关系）。
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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
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astroEDU educational activity (links to astroEDU website) Description: Understand astronomical distances using street lightsLicense: CC-BY-4.0 Creative Commons 署名 4.0 国际 (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
