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These standard candles are also called Type 1a supernovas, and their distance-measuring role is integral to measuring the rate at which the universe is expanding.—Robert Lea, Space.com, 12 May 2026 Such supernovae also function as standard candles whose absolute luminosity is correlated with their evanescent, varying brightness; the Cepheids, whose distances can be calculated, are used to calibrate the absolute luminosity of the supernovae.—Anil Ananthaswamy, Scientific American, 1 Apr. 2025 To go farther, astronomers need a brighter standard candle.—Bydaniel Clery, science.org, 13 Aug. 2024