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A type 1a supernova is possible in a globular cluster. Stars ins globular cluster evolve into a white dwarfs. If a white dwarf is in a close binary with a red giant or it is in the dense central region and comes close to a red giant, the white dwarf can accrete material from the red giant. If the white dwarf accretes enough material to reach the Chandrasekhar Limit of 1.4 solar masses gravity will overcome electron degeneracy pressure and the core will collapse triggering a type 1a supernova explosion.
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