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How could nothing is finite yet unbounded? 
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#1
Jan1414, 10:37 PM

P: 19

Hey guys. It's been awhile I don't posting in this thread.
How could space which is nothing, is finite yet unbounded? Aren't beyond the socalled finite yet unbounded universe is just nothing that we called as space? 


#2
Jan1414, 11:21 PM

P: 3,091

The surface of a sphere is finite but unbounded.
Given the radius you can determine the surface area of the sphere (finite). You can traverse it any way you want and you won't find a boundary (unbounded). 


#3
Jan1414, 11:27 PM

P: 412




#4
Jan1414, 11:38 PM

P: 3,091

How could nothing is finite yet unbounded?



#5
Jan1514, 06:03 AM

Mentor
P: 22,313

An illustration of that is our choice of starting longitude coordinate: it is completely arbitrary because there is no boundary to constrain your motion along the surface of the earth.



#6
Jan1514, 06:17 AM

P: 19

But space is not an object with shape and location. How could we say space is finite but yet unbounded? In my opinion, space is of course nonfinite but it is also noninfinite because space which is nothing, can't be said as finite or infinite because these terms imply size. Only objects have size.



#7
Jan1514, 06:29 AM

P: 3,091

If our universe was like this then light leaving the earth would eventually come back to earth once more if nothing deflected or absorbed it on the journey. http://en.wikipedia.org/wiki/Hypersphere 


#8
Jan1514, 06:46 AM

Sci Advisor
Thanks
PF Gold
P: 12,252

Look up Mobius Strip and Klein Bottle. They, also, are hard to get your head round.



#9
Jan1514, 06:16 PM

P: 98

All sections of space have a temperature, significant photon flux, etc. 


#10
Jan1514, 08:02 PM

P: 31

Perhaps you could help us to answer your question by telling us more. "How could space,* which is nothing, be* finite and* unbounded" First of all, where did you hear this quote? It looks to me like you have seen/heard/viewed two or three different theories and asked how they can all be correct. Secondly, nobody has been to the edge of space (as far as I know,lol) nor has anyone shot a beam of light in one direction and the beam return in the opposite. Because of this, nobody can provide a straightforward answer. We can however, provide theories explaining some things. Everytime I post a theorie (not of my own) I get an email that bans me from the forums. I will have to leave the theories explaining your question to others (the moderators). What stumps me on this question is, if there is an edge to the universe, whats past the edge? Nothing? Then space (referring to space as a place with nothing occupying the space) is kinda nothing, so why would there be a finite space? This is beyond most of us. There is no real fact to answer this question. Good luck on finding a straight answer😃 


#11
Jan1614, 01:29 AM

P: 412




#12
Jan1614, 02:13 AM

P: 378




#13
Jan1614, 08:13 AM

P: 211




#14
Jan1614, 08:37 AM

P: 19

Only object can have dimensions, nothingness that we called "space" can't have any dimensions. Infinite is an adjective so it only applies to object and we know, that no object can be infinite because object have shape. Thus, space is not finite or infinite and nothingness can't be finite or infinite because nothing is nothing. Btw, this is just my opinion.



#15
Jan1614, 08:39 AM

P: 19




#16
Jan1614, 09:04 AM

Emeritus
Sci Advisor
PF Gold
P: 29,241

Several people have provided elementary topological examples on how something can be finite and yet unbounded. I am not sure how you are able to ignore those and continue to hold your opinion, especially when it is not based on any solid mathematical framework. We welcome questions when you don't understand something, which was fine at the start of this thread. However, you now seem to be entrenched in your opinion despite responses to the contrary. Producing an idea based simply on your "opinion" and without any solid justification is considered to be a speculative post, which is prohibited by the forum rules that you had agreed to. Therefore, this thread is done. Zz. 


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