Question! (1 Viewer)

[Run hard@thehsc]

I am not sure but the given ans is D, can someone clarify this!

 

[Bob99]

I am getting D as the answer as well.

 

[Vall]

I would almost say B? We can determine distance via the amount of redshift each galaxy's spectra undergoes (by Hubble's law the distance from us is directly proportional to recessional speed) so A and C are eliminated as they are the most redshifted (so furthest away). D is redshifted a bit and b doesn't seem to be Doppler shifted at all - which I don't know how to interpret.

 

[bruhwth]

View attachment 36256
I am not sure but the given ans is D, can someone clarify this!

Did you get an explanation? Cause yh I'm thinking b as well. Can the lack of the shifting of spectra lines be interpreted as the galaxy being relatively similar distance to us as the sun? idk

 

[wizzkids]

The question is examining Hubble's relation between red-shift, velocity of recession and distance. This relation holds true for large distances, but within the local group, it is not true. There are galaxies like M31, the Andromeda galaxy and the Large Magellanic Cloud, which are part of our local group that are actually approaching us, so they show slight blue-shift. I think "B" is the correct answer, (unless the examiner is being misleading and Galaxy V is our Milky Way). Where was this question published?