More stars in the Milky Way or galaxies in the universe?

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Discussion Overview

The discussion revolves around the comparison of the number of stars in the Milky Way galaxy versus the number of galaxies in the observable universe. Participants explore estimates, evidence, and implications of these quantities.

Discussion Character

  • Debate/contested
  • Exploratory
  • Technical explanation

Main Points Raised

  • Some participants suggest that estimates indicate there are as many galaxies in the observable universe as there are stars in the Milky Way.
  • Others argue that the Milky Way contains between 200 to 400 billion stars, while extrapolations from the Hubble Ultra Deep Field suggest there could be about 150 billion galaxies in the observable universe.
  • One participant proposes that if the two quantities are within the same order of magnitude, it could be considered 'too close to tell'.
  • Another viewpoint is that as observational technology improves, the number of visible galaxies will increase, potentially outnumbering the stars in the Milky Way.
  • Some participants express a belief that there are more galaxies in the observable universe than stars in the Milky Way, citing future advancements in telescopes as a factor.

Areas of Agreement / Disagreement

Participants do not reach a consensus; multiple competing views remain regarding whether there are more stars in the Milky Way or galaxies in the observable universe.

Contextual Notes

Participants reference estimates and extrapolations, but there are limitations in the assumptions made regarding the visibility and counting of galaxies and stars.

Are there more stars in the Milky Way or galaxies in the universe?

  • More stars in the Milky Way

    Votes: 0 0.0%
  • More galaxies in the observable universe

    Votes: 7 70.0%
  • Too close to tell

    Votes: 3 30.0%

  • Total voters
    10
Loren Booda
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Do you think there are more stars in our Milky Way galaxy, or galaxies in the observable universe?
 
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Not at all. Estimates suggest that there as many galaxies in the observable universe as there are stars in the Milky Way.

Edit: I guess I misread the question. I thought it was "are there more stars in the MW than galaxies in the universe."

Yes, it's too close to tell. I agree with Dave.
 
Last edited:
I don't know that this really needs to be a poll - we have good evidence for the number of observable galaxies: the Hubble UDF. By extrapolation, if we repeated the HUDF and covered the entire sky, we'd see about 150 billion galaxies. It is believed that the Milky Way contains sonewhere in the neighborhood 200 to 400 billion stars.

So we're not there yet, but it wouldn't surprise me at all if we can peek just a little deeper and get a whole lot more.
 
I think that the two being within the same order of magnitude would constitute 'too close to tell'.
 
More galaxies in the observable universe. Why?

As time progresses, we will be able to see more light from the furthest galaxies, numbering in the billions, and steadily increasing, compared to the number of stars in the Milky Way, which are decreasing.
 
While Hubble did do an excellent job, I still think there are more galaxies in the observable universe than stars in our galaxy. There will be greater telescopes in the future, which will look even deeper into the cosmos.
 

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