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Author Question: What does Hubble's law tell us? A) The longer the period of a Cepheid variable, the greater its ... (Read 26 times)

imowrer

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on: Jul 27, 2018
What does Hubble's law tell us?
 
  A) The longer the period of a Cepheid variable, the greater its luminosity.
  B) The more distant a galaxy, the faster it is moving away from us.
  C) The faster a spiral galaxy's rotation speed, the more luminous it is.
  D) For every force, there is an equal and opposite reaction force.

Question 2

The density wave theory attempts to explain why the spiral arm structure persists over a long time.
 
  Indicate whether the statement is true or false


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wtf444

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Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

TRUE


imowrer

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Reply 2 on: Jul 27, 2018
Wow, this really help

pangili4

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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