On Type 1A Supernovae

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The death of a star is a horrifying thing.

It should be. The forces necessary to rip a star apart are Physics itself, pure and undiluted. Gravity overcoming the power of electron degeneracy to force a sudden moment of fusion, carbon ash set alight to fuse into heavier elements in a runaway reaction that burns 1.44 solar masses of stellar matter into nuclear ash in just over 1 second of time.

The strength of such an explosion obliterates the star entirely. Nothing remains, nothing except the ever expanding shock wave and a cloud of radioactive Nickel-56 decaying to Cobalt-56 to Iron-56. Any planets in the system will be burned to ash.

Especially planets close enough to the stellar remnant to orbit within the habitable zone. Exegol is one such planet, an undead planet orbiting the undead corpse of a star.