標ひょう準じゅん光こう源げん

noun

standard candle; standard light source

Astronomy term for a celestial object with known luminosity used to measure cosmic distances.

• Ia型いちえーがた超ちょう新しん星せいは重じゅう要ような標ひょう準じゅん光こう源げんの一ひとつです。

  Type Ia supernovae are one of the important standard candles.