Asked by Dom

A galaxy is moving away from Earth. The "blue" hydrogen line at 434 nm emitted from the galaxy is measured on Earth to be 458 nm .

Part A
How fast is the galaxy moving?

Answer--> v=____ c

Part B
How far is it from Earth based on Hubble's law?

Answer--> d=____ ly


[Please help. I'm stuck on this]
Answered by Scott
did you google Hubble's Law?
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