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    Speed of Recession of a Galaxy

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    Estimate the speed of a galaxy that is 10 billion light-years away.
    The correct answer is .5c. Can someone show me how it was calculated?

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    To calculate the speed of recession of a galaxy that is 10 billion light years away, we need to plug in the value of the Hubble Constant (H0) in the formula v = d * H0, where d = Distance of the galaxy from the Milky way.

    The Hubble Constant is not really a constant because it is a function of time. ...

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