Is the Milky Way at the center of the expanding universe?

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Discussion Overview

The discussion revolves around the concept of whether the Milky Way is at the center of the expanding universe. Participants explore the implications of cosmic expansion, the nature of the universe's structure, and the Cosmological Principle. The conversation includes theoretical considerations and analogies to illustrate these ideas.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant references Stephen Hawking's work, suggesting that the Milky Way's position implies it is the center of the universe due to galaxies receding from it.
  • Another participant counters that from any galaxy's perspective, it would appear that other galaxies are receding, implying no unique center exists.
  • A participant questions whether this perspective indicates that the universe is infinite.
  • One participant argues that the universe does not have a center, using the analogy of a rising cake with raisins to illustrate that each point in the universe experiences expansion uniformly.
  • Another participant reiterates the idea of an expanding sphere, suggesting that all points see others receding uniformly, further supporting the notion of no central point.

Areas of Agreement / Disagreement

Participants express differing views on whether the Milky Way can be considered the center of the universe. While some argue against the existence of a center, others reflect on the implications of cosmic expansion, indicating that the discussion remains unresolved.

Contextual Notes

Participants rely on analogies and theoretical concepts, such as the Cosmological Principle, to frame their arguments. There is an absence of definitive proof regarding the universe's structure and the implications of its expansion.

Passionate Eng
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I read in "The Theory of Everything" of Stephen Hawking that all of the galaxies are running away from ours.
That made me think that the Milky Way is the center of universe, since each galaxy is running away from us(like waves on the surface of water centered at one point which is the Milky Way).
Unless that the universe is infinite then it does not have center.
I wish someone understand me and tell me whether this is right or not.
:smile:
 
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If you were in any other galaxy, it would appear that (most) galaxies are receding from it.
 
Ok, but does not that mean that the universe is infinite?!
 
It doesn't actually have a center. Or, at least, if it has, we can't prove it, I guess. Think of a cake with raisins: when you put it in the oven, it starts to rise. But each raisin would see the same scenario of every other raisin of the cake around it. Every rasin would then say "ya cool I'm the center of the cake!" but it actually has no opportunity to see the whole of it from outside. We're in the same situation, but since we are not rasins, we just say "no, there's no reason we should be at the center of the universe". This is what is called" Cosmological Principle".
 
it is clear now
thank you very much
 
I suggest the link in my signature
 
Passionate Eng said:
Ok, but does not that mean that the universe is infinite?!
Think of the surface of an expanding sphere. Each point sees all other points receding uniformly.
 
Thanks for all
 

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