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Astronomy and Cosmology
Cosmology
Clarification about the size of the Universe
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[QUOTE="Ibix, post: 6816465, member: 365269"] It doesn't matter how you vary the content of the universe, you never need anything outside it to explain anything. We can make accurate predictions with only the universe and the stuff in it. A universe consisting of only five stars would not have a curved space (at least not in the sense that the term is used in cosmology - it would not even have a uniquely identifiable notion of "space"). It would be difficult to see where one could start to end up with such a thing - but you can describe it without reference to anything outside the universe. I'm afraid you are running into a fairly common problem, which is that this kind of thing is interesting and you want to speculate about it, but you haven't studied enough maths to properly understand the models and consequently your speculation instantly wanders into the weeds. It's like the difference between listening to music and playing an instrument. Any fool can hit a button on a media player, but you have to put in some hours if you want to be able to play even in the back room of a pub. [/QUOTE]
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Cosmology
Clarification about the size of the Universe
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