Is Redshift an Accurate Indicator of the Universe's Expansion Rate?

  • Thread starter Thread starter _Mayday_
  • Start date Start date
  • Tags Tags
    Redshift
AI Thread Summary
Redshift is a key indicator of the universe's expansion, suggesting that distant galaxies are moving away from us. The discussion raises questions about whether there are other forms of frequency shifts beyond redshift and blueshift, and if experiments have confirmed that redshift indicates movement away from an observer. It also highlights the concept that current redshift measurements reflect the universe's expansion rate from the past due to the time light takes to travel to us. Understanding how to calculate the current rate of expansion is crucial, especially in light of potential changes in that rate over time. The conversation emphasizes the need for ongoing research and data to clarify these cosmic dynamics.
_Mayday_
Messages
808
Reaction score
0
Hey! :smile:

I have a few questions regarding redshift. Firstly are there example of a shift in frequency of light other than the one seen in redshift or blueshift. I mean are there experiments that have been conducted that prove that this noted shift to the red end of the spectrum mean that something is moving away relative to an observer?

Secondly, would I be correct in saying that the noted redshift now is actually, and indication of the rate of expansion quite a while back, taking into account the speed that the light takes to reach the observer. How do we know that the rate of expansion has decreased or infact it has start to contract again? There must be a way to calculate the rate of expansion now.

Thanks for any help!

_Mayday_
 
Physics news on Phys.org

Similar threads

I Cosmological Redshift and Expansion
Replies
20
Views
1K
I How do you get to the conclusion that there is accelerating expansion?
Replies
23
Views
2K
I Material source of the quasar redshift
Replies
5
Views
2K
B Where does the light energy lost due to expansion go?
Replies
13
Views
2K
B Help with when expansion acceleration began
Replies
23
Views
3K
Could Redshift not result from the Doppler effect?
Replies
27
Views
6K
I Galaxy redshift and thermodynamics
Replies
10
Views
3K
I Problem interpreting a Distance-Redshift Plot
2
Replies
55
Views
10K
B The accelerated expansion of the universe; redshift and time/distance
Replies
3
Views
2K
I Expansion of Space: Questions on How the Universe Works
Replies
1
Views
1K

Hot Threads

Recent Insights

Back
Top