25.1.3—An object of known luminosity is called a standard candle

understand that an object of known luminosity is called a standard candle.

Use —an object of known luminosity is called a standard candle to connect the rule to the data and decision in the question.

This matters because —an object of known luminosity is called a standard candle determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —an object of known luminosity is called a standard candle to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —An object of known luminosity is called a standard candle is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.