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Time travel
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how big is the universe
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darveen
9/21/07
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how big is the universe
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amanda8
11/14/09
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The universe is infinite. It doesn't only exist where there is matter, also where fields are.
At least double 13bilj lighty., we can look in opposite directions.
If you look at a star at 'our' edge 13 bilj lighty. away, there's a boundary, our horizon. But the creatures that live there also can look in two opposite directions; ours and even further away.
If you would freeze the universe and travel there, the horizon-'bubble' would travel with you.
The universe has since its beginning been infinite, but also expanding. The 13bilj only tells you how old the universe is and how far you can see, not how big it is.
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scbrow
9/22/07
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Our universe was created by a collosal explosion of matter 13 billion years ago called the big bang. In that time, this matter has expanded to a width of over 1666000 light years.
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Deadfire
5//09
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It is only as big as it has to be to contain the matter within. Anything beyond that matter doesnt exist because it doesnt have to. And as long as matter keeps expanding outwards, the universe will continue to grow with it, so that boundary of the universe will never be reached. So technically its finite, but naturally infinite.
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sw345er
9/13/09
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This is one with which I can agree - no argument.
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