Perhaps Sher 25 will be the first. Sher 25, designated by the arrow, is a blue supergiant star located just outside the open star cluster and ionized region named NGC 3603. Now the hourglass shaped rings around SN1987a were emitted before that blue supergiant exploded . Maybe Sher 25 has expelled these bipolar rings in a step that closely precedes a supernova . If so, Sher 25 may be within a few thousand years of its spectacular finale.
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