Definitions for "Standard Candle"
A type of object whose brightness is well understood. Standard candles are used to determine how far away distant objects are. Cephied variables and supernovae are used as standard candles.
A general term for any astronomical object whose absolute magnitude can be inferred from its other observed characteristics, and which is therefore useful as a distance indicator.
luminous objects of a known luminosity used to measure large distances via the inverse square law of light brightness.