" The closest star is millions of lightyears away, If it's about to supernova then we won't see it for millions of years. "
Proxima Centauri is only 4.2 light-years away.
Edit: Also, everything recorded in astronomy is recorded from our perspective. When supernova 1987A exploded in 1987, we new it happened well before we saw it, but it's still recorded as occuring in 1987.
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