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What speed should a galaxy move with...

What speed should a galaxy move with respect to use so that the sodium line at 589.0 nm is oberved at 589.6 nm ?

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`(triangle lambda)/(lambda)= (V)/(C ), V= +c((0.6)/(589.0))= +3.06xx 10^(5) ms^(-1)`
Therefore, the galaxy is moving away from us with speed 306 `km"/"s`.
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