Question 1 A standard candle is: A variable star - all variable stars have the s

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Question 1 A standard candle is: A variable star - all variable stars have the same intrinsic brightness, so by measuring the apparent brightness, we can determine their distance A type of star whose brightness is related to some other measurable property, so that we can use the apparent brighness to determine its distance. A standard light source (traditionally a candle, but since replaced by LEDs) that is used to calibrate optical instruments A type of star whose brightness is constant, so that we can use the apparent brighness to determine its distance. Type 1a Supernovae are the only standard candles. Next:

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A type of star whose brightness is related to some other measurable property, so that we can use the apparent brightness to determine it's distance.

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