To be a standard candle an object must have a constant
A) lifetime.
B) brightness.
C) luminosity.
D) distance.

Question

Quizplus · Accepted Answer

A standard candle must have a constant luminosity, meaning that its brightness remains the same regardless of distance. This allows astronomers to use the observed brightness of the object to determine its distance. The other options (lifetime, brightness, and distance) do not need to be constant for an object to be used as a standard candle.

To Be a Standard Candle an Object Must Have a Constant