Astronomers studying the rate at which the Universe is expanding make use of obs

Question

Astronomers studying the rate at which the Universe is expanding make use of observations of Type Ia supernovae. These are the results of the explosions of an object called a white dwarf (which is the dead core of a star of similar mass to the Sun). These are very important as it is thought that all Type Ia supernovae have the same intrinsic luminosity. Assuming this to be the case, what would be the ratio of the
brightness of two Type Ia supernovae, one observed in galaxy A, with a redshift of 0.8, and one in galaxy B, with a redshift of 0.2, as seen from the Earth?

Explanation / Answer

(Luminosity of A and B are the same, so it cancels out)

So Supernova from galaxy B is 16 times brighter than one from galaxy A.

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