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]
1 answer
did you google Hubble's Law?