How big is the universe ?

[GOD]

Its 13.7 billion years old , nothing is faster than the speed of light = its radius can only be 13.7 billion light years .

 

[Crimzen]

haha wow its so obvious and yet i never thought of that

no object made from matter can go faster than the speed of light
i dont think theres a wall or physical border moving at any speed though

 

[GOD]

It might be obvious but it isnt right....................?????

 

[restin]

good thought. And if it started from one single point, the universe is also a perfect sphere. And it also expands.

 

[GOD]

"if it started from one single point, the universe is also a perfect sphere."


................................NO !

It wasnt a perfect explosion . It had variablitys .

 

[restin]

well the explosion only affected matter, time goes in every direction, no matter how the explosion was.

 

[cockknocker]

I saw a programme which said that a theory of the shape of the universe was a 4-dimensional doughnut.

 

[Crimzen]

It might be obvious but it isnt right....................?????

things that are obvious are always right..........?????

I'm not saying its a bad idea in fact i think its friggin excellent
but the universe isnt made of anything, well the space between mass isnt

Basically, since light has no mass, it can move faster than anything else and requires no more energy than itself to move at that speed. As you approach the speed of light, your mass increases, requiring more and more energy to accelerate. Therefore, at the speed of light, any object that had any amount of mass to start with would now have infinite mass, and it would have required an infinite amount of energy to accelerate it to that speed. Since light particles have no mass, they are the only things that can travel as fast as light.

this explains why exactly, but it only includes mass
space in the universe has no mass so could move faster than light

 

[GOD]

Explain that please......... and this time on your own and not useing quotes ?

Space = the universe must have a limit / border that started with the big bang and has expanded since then . You say space is nothing , are you saying that nothing is faster than light ? or that nothing IS faster than light ? What doresnt exist and how can something that doesnt exist expand faster than the speed of light ?

 

[Crimzen]

first dont be condescending

space is a part of the universe
space itself isnt made of mass and as far as science knows its nothing but a vacuum, yet it does make up a vast majority of the universe

i dont know how large the universe is nor how fast its expanding so i cant tell you whether or not space is moving faster than light
movement and expansion in this sense would have to be seen as separate because space doesnt move if it doesnt have mass
but theoretically i see no reason than space couldnt expand at a speed faster than light because the only thing stopping mass from moving at the speed of light is that it would become infinitely heavy and need infinite energy to accelerate

so if there is no mass but something is "moving" then why couldnt it go faster than light?

 

[GOD]

"movement and expansion in this sense would have to be seen as separate because space doesnt move if it doesnt have mass "

"Your" quote says light doesnt have mass but that it has a speed and movement .

How can space expand if it doesnt move ?

How can a vacume have a speed or movement or an edge ?

 

[Crimzen]

ok then fine space doesnt exist
:roll:

by movement i meant from 1 point to another
expansion is growth in all directions

im not here to argue i was trying to discuss something with you but it seems you are adamant that your theory is correct so why bother

light doesnt have mass but it does have particles

How can a vacume have a speed or movement or an edge ?
i already said i dont think it does have an edge

 

[GOD]

"but it seems you are adamant that your theory is correct"

What theory ?

Your trying to say expansion and growth arent movement ? That space doesnt have an edge / limit . That the big bang theory is wrong ?

Anything that grows must have clear borders = an edge .

 

[Crimzen]

what theory?
read your own first post

expansion and growth are expansion and growth but sure you could call them movement
since when does something that expands need to have an edge
what do you propose this edge is made of?

you are avoiding my argument

the fact that space has no mass means that it is possible for it to expand faster than light
OK?! simple as that, is it hard to fathom?

 

[GOD]

"read your own first post "

Read it yourself . Theres no theory of mine there .

"since when does something that expands need to have an edge "

An edge , limits , borders . If i t hasnt got one how does one define it and how can one measure growth or movement ?

"what do you propose this edge is made of? "

I dont propose anything about what it is made of ? Must it be made of something ? It must have limits and a definition .

"you are avoiding my argument "

What argument ?

"the fact that space has no mass means that it is possible for it to expand faster than light "

Light has no mass so haveing no mass isnt an argument for something traveling faster than light .

"OK?! simple as that, is it hard to fathom?"

I already know the answerS to what i`ve written .

 

[Mr.Smith]

its exactly 1 Universe accross

 

[Crimzen]

Its 13.7 billion years old , nothing is faster than the speed of light = its radius can only be 13.7 billion light years .

that is a theory.

Light has no mass so haveing no mass isnt an argument for something traveling faster than light .

no
the only reason things CANT move faster than light is because they have mass
i didnt say anything DOES move faster than light i said it is POSSIBLE for space to expand faster than light because it has no mass. didnt say it does, only that its not impossible

i thought i made myself quite clear in my last reply but i guess not..

 

[restin]

An edge , limits , borders . If i t hasnt got one how does one define it and how can one measure growth or movement ?

Hmm I'd say that a border is a separation between two systems/structures, somehow a segregation between two types of homeostasis.

This means that there border needs two systems to exist - because if not, the definition is futile.

Now you ask, what is the border of the universe -

- and I believe you see where the problem is.

Universum means all,everything,everything-that-is.

And if you ask for the border of the universe, this is a paradoxon because you say that there is a second structure beyond it - which doesn't make sense as the universe already IS everything.

 

[Brugmansia]

http://en.wikipedia.org/wiki/Observable_universe

 

[GOD]

Please stop posting links and quoteing things directly . Lets talk about it and not just kill the theme with wikipedia quotes . The point of the thread was to think about a common missconception . I only know the answer because someone asked me and i made a guess ( wich he showeed me was wrong ) .

The quote doesnt answer the question ( allthough it does give a lot of information on the subject and a big part of the answer ) . It talks about the observable universe not about how big the universe is .