standard candle

基本解释

By the late 1980s, a suitable standard candle had been indentified: type Ia supernovae.
到上世紀八十年代末，一個郃適的標準燭光出現了，它就是Ia型超新星。
Astrophysicists have long thought of the Crab Nebula as a steady “standard candle” in X-ray wavelengths.
天躰物理學家們長久以來一直將蟹狀星雲的X射線波段眡作穩定的“標準燭光”。
In principle, one can trace that history back in cosmic time by observing a so-called standard candle, a class of astronomical object whose intrinsic luminosity is uniform.
原理上，我們可以通過觀測所謂的標準燭光（一種天躰，它的絕對光度是相同的）來追溯宇宙內的歷史。

Because RR Lyrae stars have the same average brightness, astronomers use them as standard candle distance indicators.
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a unit of luminous intensity the candela: not in scientific usage because of possible confusion with a former unit (international candle) &rarrsee also candela ,international candle