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from the white dwarf's normal binary companion accretes onto it, and its temperature and density increase to the point of ignition, causing it to violently explode. Typically, we see the effects of type Ia supernovae on the composition of the ISM around 1 billion years after the start of star formation in that galaxy. Meanwhile, core-collapse supernovae are the deaths of massive stars, which typically live only a few million years. This means that as a general rule, the ratio of magnesium to iron abundance in stars that form earlier than 1 billion

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