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Do supernova remnant nebula re-collapse into a star?

What goes up, must come down... unless it exceeds escape velocity. ;) There are several types of supernova. I assume you're primarily interested in the core collapse supernovae that leave a neutron ...
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Wouldn't the 1054 supernova have temporarily enlightened the Earth like the Sun?

The peak absolute magnitude of a Type Ia supernova is -19.5. The relation between absolute and apparent magnitude for nearby objects ($z \approx 0)$ is $$m = M + 5\,(\log_{10}(d) - 1)$$ where $d$ is ...
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