| 11. | Baum used just a single globular cluster, but individual formations are often poor standard candles.
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| 12. | Thus, this relation does not employ standard candles.
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| 13. | This makes them very useful as standard candles.
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| 14. | It is used as a standard candle in the calibration procedure of X-ray instruments in space.
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| 15. | Usually, astronomers use standard candles : objects for which the intrinsic brightness, the absolute magnitude, is known.
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| 16. | So type Ia supernovae can be used as " standard candles " to determine their true distance.
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| 17. | Several methods rely on a "'standard candle "', which is an astronomical object that has a known luminosity.
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| 18. | Type Ia supernovae are the best-known standard candles across cosmological distances because of their extreme and consistent luminosity.
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| 19. | Standard candles used to measure the expansion history of the Universe also need to be corrected for dust extinction.
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| 20. | So another type of " standard candle " _ one vastly brighter than the Cepheid variables _ is needed.
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