In a uniformly expanding universe, which statement best describes ...

[abarnes]

In a uniformly expanding universe, which statement best describes the situation as viewed from an observer in Galaxy C (not the Milky Way Galaxy)?
 
  A) Galaxy C observer sees some galaxies moving away, some moving towards itself.
  B) Galaxy C observer sees all galaxies moving away from the Milky Way Galaxy.
  C) Galaxy C observer sees all other galaxies moving away from itself.

Question 2

If we know the average separation and period of revolution for a binary system, we can then measure
 
  A) the actual luminosity of each star.
  B) the actual mass of both individual stars.
  C) their absolute magnitudes.
  D) the actual sizes of the two stars.
  E) the total mass of the system.

[katkat_flores]

Answer to Question 1

C

Answer to Question 2

E