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

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SUMMARY

The discussion centers on the concept of redshift as an indicator of the universe's expansion rate. Participants explore whether redshift is solely indicative of objects moving away from an observer and discuss the implications of light travel time on measuring current expansion rates. The conversation highlights the need for accurate calculations to determine if the universe's expansion is slowing or reversing. Key resources shared include links to Doppler effect explanations and Wikipedia entries on redshift.

PREREQUISITES
  • Understanding of redshift and blueshift phenomena
  • Familiarity with the Doppler effect in astrophysics
  • Knowledge of light travel time and its implications in cosmology
  • Basic principles of cosmic expansion and contraction
NEXT STEPS
  • Research the Doppler effect and its applications in astronomy
  • Study the methods for calculating cosmic expansion rates
  • Explore the implications of light travel time on observational astronomy
  • Investigate current theories regarding the universe's expansion and potential contraction
USEFUL FOR

Astronomers, astrophysics students, and anyone interested in the dynamics of cosmic expansion and the implications of redshift in observational studies.

_Mayday_
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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_
 
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