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A single star in this galaxy has gone supernova – brightening dramatically for just a few months before disappearing again.
Supernova explosions of individual stars can be so bright that they outshine an entire galaxy.
Supernovas peak at about the same luminosity, making them a useful tool for measuring distances to galaxies.
A Cepheid Variable Star will get brighter and fainter over the course of several days.
We can know the intrinsic luminosity of a Cepheid Variable Star by measuring the period of its variation.
Light Travel Time
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