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When a star explodes as a supernova, it has finished it's main sequence, is in maturity and when it finally explodes it's in the stellar remnants stage.
A white dwarf star is capable of turning into a supernova if the fusion action is reignited. It can also happen when a star starts to collapse.

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8y ago
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13y ago

The terminal stage - the star is literally torn apart, leaving behind a dense stellar remnant.

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Q: Which evolutionary stage of a massive star is called a supernova?
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