The peak brightness of two white dwarf supernovas are observed in the distance; Supernova A is as bright as Supernova B. The inverse square law of light tells us that Supernova A is ................ Supernova B.
The inverse square law of light tells us that the brightness of an object decreases with the square of the distance.
If Supernova A is observed to be as bright as Supernova B, it means that the distance from Supernova A to the observer is closer than the distance from Supernova B to the observer.
Therefore, Supernova A is closer to the observer compared to Supernova B.