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As the Sun nears the end of its life it will evolve into a red giant. The mass of the Sun will remain relatively unchanged, but the Sun will grow to approximately the current size of Earth's orbit ($215$ times the Sun's current radius). The Sun currently rotates once every $25\text{ days}$.

By what factor will the Sun's angular velocity change as it grows into a red giant?

A

$46{,}225$

B

$2{,}160{,}000$

C

$215$

D

$2.16\cdot { 10 }^{ -5 }$

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