Black holes hurl stars out of galaxy, after which they explode

On the simplest level, there are only two types of supernovae: those caused when a massive star collapses and those caused when white dwarf stars reach a critical mass. But the better we're able to image supernovae, the more we're finding out that there are distinct subtypes within each of these classes. Or, as the author of a new paper put it, "It turns out that there were about a dozen new classes of ‘exotic’ or ‘peculiar’ transients lurking in the shadows."

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