How much does the star's core shrink in size during the final implosion phase?

Answer

It shrinks from a size comparable to the Earth down to a sphere only a few tens of kilometers across.

During the incredibly short implosion phase, the core shrinks dramatically, reducing its size from that comparable to the Earth down to a sphere only a few tens of kilometers in diameter.

How much does the star's core shrink in size during the final implosion phase?

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