Question: A galaxy is moving away from Earth. The blue hydrogen line at 434nm emitted from the galaxy is measured on Earth to be 650nm. (a)

A galaxy is moving away from Earth. The “blue” hydrogen line at 434nm emitted from the galaxy is measured on Earth to be 650nm.
(a) How fast is the galaxy moving?
(b) How far is it from Earth?

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a Use Eqs 334 and 335a to solve for the speed of the gal... View full answer

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