When the light coming form a galaxy in the constellation Ursa Major was spectro graphically anaylised, it was found to contain a line in the calcium a

When the light coming form a galaxy in the constellation Ursa Major was spectro graphically anaylised, it was found to contain a line in the calcium a
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When the light coming form a galaxy in the constellation Ursa Major was spectro graphically anaylised, ... us? What is the velocity of recession?
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