We call these stars supergiants and they are 20 times more massive than our own sun and so when these stars go supernova they expand to a radius of up to a billion miles, becoming the biggest and brightest star in the universe.

BBC: NASA's Swift satellite observes massive supernova stars

Yet even when it does, the sun will come up in the morning and life will go on as if nothing is happening, such is the chronic way the world changes.

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