What does Hubble's law tell us? A) The longer the period of a ...

[imowrer]

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

[wtf444]

Answer to Question 1

B

Answer to Question 2

TRUE

[imowrer]

Excellent

[bitingbit]

Thanks for the timely response, appreciate it