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Runaway Universe
Birth of a Supernova
Type 1a
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Type 1a (1)

Type Ia supernovae originate in binary star systems—systems where two stars orbit each other. In one possible scenario, there are two stars approximately the same size—let's say about the size of our sun. At a certain point in their lifetimes, each star will expand into a red giant, then turn into a white dwarf.

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