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