So for decades, astronomers have used it as a "standard candle" in the field of high-energy astrophysics.

因此几十年来，天文学家一直将其视为高能天体物理领域的“标准烛光”使用。

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Another type of standard candle is a type of star called a Cepheid variable.

另一种标准烛光是一种叫做造父变星的恒星。

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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，我们可以通过观测所谓的标准烛光(一种天体，它的绝对光度是相同的)来追溯宇宙内的历史。

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Because RR Lyrae stars have the same average brightness, astronomers use them as standard candle distance indicators.

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