Does Redshift Indicate Mutual Movement Between Distant Galaxies?

  • Thread starter Thread starter aerogurl2
  • Start date Start date
  • Tags Tags
    Galaxy Redshift
AI Thread Summary
Redshift indicates that a distant galaxy is moving away from our galaxy, which is a consequence of the universe's expansion. Observers in that distant galaxy would also perceive a redshift in the spectrum of the Milky Way, suggesting mutual movement. The discussion emphasizes the importance of frames of reference in understanding redshift and relative motion. Special relativity and the Doppler effect are relevant concepts that help explain these observations. Understanding these principles clarifies the relationship between redshift and the movement of galaxies.
aerogurl2
Messages
34
Reaction score
0
I don't understand whether this is true or false. It goes like this:
if a distant galaxy has a substantial redshift ( as viewed from our galaxy) then anyone living in that galaxy would see a substantial redshift in a spectrum of the Milky Way galaxy.

I know redshift is when the object is moving away from our galaxy, then wouldn't we see that galaxy moving away as well? am i offtrack??
 
Physics news on Phys.org
Yes, we would see the galaxy moving away from us too, but what does that have to do with the question? The question is hinting at frames of reference.

Do you know about special relativity and the doppler effect?
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top