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Phil Plait has a post up about NGC 1316, a galaxy careless enough to let four of its stars go supernova in the space of 26 years, two in the past six months. For comparison the average is one per century (Without more information I would assume this is referring to more massive galaxies with active star formation like our own).
I could go on more, I suppose, but pretty much everything is covered at Bad Astronomy. Well, I can add that a galaxy is a very big place and these two supernovae certainly occurred thousands of light years distant from each other. They would have exploded centuries, perhaps millenia apart in time and it is only coincidence we see them at nearly the same time (same for the other two, too).
I could go on more, I suppose, but pretty much everything is covered at Bad Astronomy. Well, I can add that a galaxy is a very big place and these two supernovae certainly occurred thousands of light years distant from each other. They would have exploded centuries, perhaps millenia apart in time and it is only coincidence we see them at nearly the same time (same for the other two, too).
