Which statement is true about Redshift and the Hubble constant?

[through.time]

Which statement is true?

A The apparent speed of recession of a galaxy is given by the product of the Hubble constant and the distance to the galaxy.

B The further away a galaxy is, the lower its apparent speed of motion away from us.

C A galaxy with a redshift of 5.37 is situated at a look-back time of 4.1 billion years.

D Space is expanding uniformly so that the distance between galaxies remains constant.

 

[negitron]

Which statement(s) do you think is/are true and why?

 

[through.time]

I think statement A is true but I'm not 100% sure whether D is false and there is only one true statement.

 

[AstroRoyale]

Well, to rule out C you can have a look at Ned Wrights Javascript cosmology calculator to determine the lookback time. Just plug in 5.37 for the redhshift. The light travel time is the "lookback time".

http://www.astro.ucla.edu/~wright/CosmoCalc.html

 

[negitron]

Well, isn't it generally true that the farther a galaxy is from us, the faster it appears to be receding?

 

[through.time]

Yeah, I didn't think B or C were the answers.
I'm still stuck between whether A or D is the right answer and I really need help.

 

[cepheid]

Does it make any sense for the distance between things to remain constant in an *expanding* universe?

When we say that a galaxy is moving away from us, what does that mean? Does it not mean that it is getting farther away with time?

 

[Berry Ives]

Statement A is definitely correct.