Why is the direct observation of a star transitioning into a supernova considered an immense scientific milestone?
Answer
It helps calibrate understanding of stellar interiors and final collapse physics.
Being able to study the transition phase directly is immensely valuable because it helps scientists calibrate their understanding of stellar interiors and the physics governing the final collapse that leads to the blast wave.

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Why Do Some Red Giant Stars Explode As Supernovae? - YouTube
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