To be a standard candle, an object must have a constant:
A) lifetime
B) brightness
C) luminosity
D) distance
E) mass

Question

Quizplus · Accepted Answer

A standard candle is an object with a known luminosity, which means that its brightness can be used to determine its distance. This requires the object to have a constant luminosity, regardless of its lifetime or other properties. Therefore, the correct choice is C - luminosity.

To Be a Standard Candle, an Object Must Have a Constant