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Estimate how long does would it take for the stars Spica, alpha-centauri A, and Barnard Star...

Estimate how long does would it take for the stars Spica, alpha-centauri A, and Barnard Star to gravitationally contract (via the Kelvin-Helmholtz mechanism) in the absence of nuclear energy. Give your answer in terms of the timescale for the Sun.You will need to check the HR diagram.

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