What is the distance to the nearest star?

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Discussion Overview

The discussion centers on the distance to the nearest star, specifically Proxima Centauri, and expands to inquiries about the distances across galaxies and the size of the observable universe. It includes references to various sources and models related to cosmological measurements.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants assert that Proxima Centauri is the nearest star at approximately 4.3 light years away.
  • There are references to external sources, including Wikipedia and other websites, for further information on the observable universe.
  • One participant mentions a distance to the edge of the observable universe as 78 billion light years, while another challenges this by stating it should be about 46 billion light years according to the current cosmological model.
  • A participant suggests consulting Ned Wright's "FAQ in Cosmology" for explanations on calculating distances, noting that these calculations may not be exact.
  • A humorous remark is made regarding the significance of differences in numerical values, referencing a quote by Asimov.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact distance to the edge of the observable universe, with competing views presented regarding the correct measurement. The discussion remains unresolved on this point.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about cosmological models and the definitions of distances used. The varying estimates for the observable universe highlight the complexity and evolving nature of cosmological measurements.

MightyMeanie
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What is the distance to the nearest star? Is the nearst star Proxima Centauri (and it being 4.3 lightyearsaway)? Whats the Distance across a galaxy and the size of te observable Universe? :bugeye:
 
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MightyMeanie said:
What is the distance to the nearest star? Is the nearst star Proxima Centauri (and it being 4.3 lightyearsaway)? Whats the Distance across a galaxy and the size of te observable Universe? :bugeye:
The first part of you question is answered here:

http://www.anzwers.org/free/universe/12lys.html
 
Hurkyl said:
en.wikipedia.org is often a good reference for lots of things. I entered "observable universe" into its search function, and it gives this page:

http://en.wikipedia.org/wiki/Observable_universe


thanks, i didnt know about wikipedia :approve: I've added it to my favourites thanks x
 
From wikipedia:
The present distance (comoving distance) to the edge of the observable universe is larger, since the universe has been expanding; it is estimated to be about 78 billion light years
This is wrong. In the current cosmological model the edge of the observable universe would be located at about 46 billion lightyears.
 
Last edited:
I was reading a book today which mentioned 78 billion light years.
 
To paraphrase Asimov, differences of less than a factor of ten are rarely important, except in the matter of salaries where factors of two matter.
 

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