Can the universe be like a circle? where it just loops rather than end?
- YKhanLv 74 weeks ago
It is a possibility. It's what's known as a "closed" universe, meaning it loops back in on itself, meaning that it has no ends, it just keeps going around and around. However, if it is such a universe, it would have to be doing that at a scale so large, that it's not even noticeable within our observable portion of it. The current size of the observable universe is about 42 billion light-years radius all around us. We've been attempting to measure the curve of the universe all around us, and so far most of our measurements suggest that it is mostly flat.
- Adullah MLv 74 weeks ago
I think the centrifugal forces and centripetal forces that keep the whole universe in circular motion.
- 4 weeks ago
That's a theory - that there's a big bang, and expansion up to a point, then, it all falls back together to start once again... Right now, it doesn't *look* like that happens, as the expansion we see isn't slowing down - it's speeding up.
- nineteenthlyLv 74 weeks ago
Yes that is what it's like.
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- Jeffrey KLv 64 weeks ago
That is what many scientists believe, including Einstein. We live in the 3D surface of a 4D hypersphere. Our 3D space is finite but has no boundary.
- CarolOklaNolaLv 74 weeks ago
No. A circle is flat. It has only 2 dimensions, radius and circumference. It has ZERO volume Atoms have 3 spatial dimensions. So do quarks. The Universe, the SPACE and VOLUME of the Universe is expanding, SLOWLY. We DO NOT KNOW what the SHAPE of the Universe is. It may be changing constantly. ALL we know is that the Universe is finite and MATHEMATICALLY "flat" in at least 3 spatial dimensions and 1 temporal dimension.
- daniel gLv 74 weeks ago
A lot of possibilities and theories. a circle would have to be sphere given the spatial dimensions but doesn't seem to have any boundaries. If such limits exist, they are so far out there, it is beyond the scope of imagination. What we know of it, is one huge space with billions of galaxies so far separated that distance is mind staggering.
My own notion is simply an infinite void with lord knows how many universes like ours may be out there. Too far distant to even see. Hubble has discovered galaxies some 39 billion light years distant and the limit of detected CMBR. What may be beyond that is just more universe.
- PearlLv 74 weeks ago
anything is possible
- Old Man DirtLv 74 weeks ago
There are several other models:
1. Torus which is the shape of a donut.
2. Kline container (which has no "inside" or "outside").
While the "static universe" model is not currently the popular model, it can not be entirely ruled out. The string universe model I think is still in the running.
Given the size of the universe and our knowledge base is very limited. If it did loop we would not know we were seeing ourselves if we did or could.