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