Re: Re: "Life" of the Universe
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Originally posted by Kzin
This only happens if the MASS of the Universe exceeds a critical level - effectively there has to be enough stuff (mass) to have enough gravity (curve space) to make everthing fall back - now where are those donuts :p
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Originally posted by Kedeman
I think it was "scientifically prooved" two years ago, that universe expands without bounds by finding evidence of it's acceleration
Okay... I'm going to try and clarify this, but keep in mind, there are conflicting theories...
The universe is expanding, but it is not increasing in mass. The universe was bestowed with an amount of energy (like throwing a ball up) and, it the theory holds, the universe should be slowing its expansion (like a ball going up). It should eventually begin to pull back together under its own weight, which is constant.
Mind you, there are some questions to this... there is theory that there is naturally occuring anti-gravity. If there is, then it is helping to push the universe apart. Eventually the universe should reach an equalibrium, where it neither expands nor contracts. Either that, or the anti-gravity matter will seperate itself from the gravity matter, kind of like oil and water. Anti-gravity matter should, in effect, float in a condensing matter universe.
The total matter of the universe should not be increasing. It is possible. If it is, then the big bang is most likely moot. Yes, the amount of matter in the universe is in flux as it changes to and from energy, and as the universe "cools" more energy will become matter and add to the gravity that pulls the universe together, but the universe shouldn't be getting extra matter from no where.
Again, though, it is possible. The crazy notions of sub-space or extra-spacial dimensions come into play. We could be pulling in or leaking out matter to another universe.
Anyway... this gets into lots and lots of stuff that we haven't a clue about, but for the big bang to hold, the universe will stop expanding and begin contracting.
Oh, I have an off-topic question... when we say the universe is expanding, we do mean the matter in the universe, right? There is an infinite container (the void of space) that holds the universe, right?
Re: Re: Re: "Life" of the Universe
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Originally posted by CiberTHuG
Oh, I have an off-topic question... when we say the universe is expanding, we do mean the matter in the universe, right? There is an infinite container (the void of space) that holds the universe, right?
No - interestingly enough its the "container" i.e. the actual fabric of space that's expanding - thats the neat thing about it. I think that the first indication was in the 1930s with the discovery of Hubble's constant. I'll try to find you a reference if you want.
More later but its dinner time now . . .:)
Re: Re: Re: Re: "Life" of the Universe
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Originally posted by Kzin
No - interestingly enough its the "container" i.e. the actual fabric of space that's expanding - thats the neat thing about it. I think that the first indication was in the 1930s with the discovery of Hubble's constant. I'll try to find you a reference if you want.
More later but its dinner time now . . .:)
Well, if the universe is not expanding but space itself is dilating this pulls another plank from the Big Bang Theory's already shaky platform.
'Course, it would be interesting to see the relation between spatial and temporal dilation. How much time has passed at the universe's rim and how much has passed at its core?
Re: Re: Re: "Life" of the Universe
Quote:
Originally posted by CiberTHuG
The universe is expanding, but it is not increasing in mass. The universe was bestowed with an amount of energy (like throwing a ball up) and, it the theory holds, the universe should be slowing its expansion (like a ball going up). It should eventually begin to pull back together under its own weight, which is constant.
In Newtonian terms whether it falls back or not would depend on whether the kinetic energy exceeds the gravity pulling it back and that is determined by the amount of mass that there is pulling it back - which is why the question of 'missing mass' is so critical.
Re: Re: Re: Re: "Life" of the Universe
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Originally posted by Kzin
In Newtonian terms whether it falls back or not would depend on whether the kinetic energy exceeds the gravity pulling it back and that is determined by the amount of mass that there is pulling it back - which is why the question of 'missing mass' is so critical.
Yes, the question of dark matter (and anti-gravity matter).
'Course, for the theory to hold, the universe must stop expanding and begin collapsing. It can't (in Newtonian terms) break away from gravity and go into "orbit".
I somehow doubt that the Big Bang holds.
But... if the matter is not moving away of its own accord, then why does the weight (and gravity) of the universe matter? What is causing the spatial dilation that is causing the universe to expand? Are you saying it can be defeated by the universe's gravity?
Re: Re: Re: Re: Re: "Life" of the Universe
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Originally posted by CiberTHuG
'Course, for the theory to hold, the universe must stop expanding and begin collapsing. It can't (in Newtonian terms) break away from gravity and go into "orbit".
Nope - you can have (i) a big bang with an open universe (the matter just gets more and more spread out) - it is not orbiting because the matter itself is not actually moving out - its the "fabric of spacetime" (and there is no radial component of mothion anyway) , (ii) an big bang with a static universe - there is just enough kinetic energy to balance the graviational energy, (iii) a big bang with a closed universe - enough mass to make it all fold up again
I'm not aware that the non-big bang lobby have had much credibility in our lifetimes - its really a question of "what sort of big bang" and why?
Re: Re: Re: Re: Re: "Life" of the Universe
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Originally posted by CiberTHuG
But... if the matter is not moving away of its own accord, then why does the weight (and gravity) of the universe matter? What is causing the spatial dilation that is causing the universe to expand? Are you saying it can be defeated by the universe's gravity?
Here are two pointers that help with this
THis is the best
http://www.mathpages.com/rr/s7-01/7-01.htm
Nasa and missing mass
http://imagine.gsfc.nasa.gov/docs/as...s/980109a.html
Re: Re: Re: Re: materialism
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Originally posted by Kzin
We are talking about what used to be called Natural Philosophy and is now called Science. If you are considering a non-empirically based philosophical construct then just about anything goes and we can shift to a completely different type of discussion - more entertaining but less fruitful. (e.g its "all Monads and its eternal damnation for anyone who doesn't believe in Monads")
If you are unaware of recent work I suggest that you read Daniel Dennett and Francis Crick's recent books to give a good background on the subject before thinking any further.
I have a problem and I also have limited time, without having to read through tons of books, can you shortly define what conscieness is and how it is related to physical nature? If this is science, i'm going to be very thankful for what you have to say :)
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Originally posted by Kzin
Can I ask you to go over this more clearly please. I don't think that it is purely a language problem that we are having here (just looking at the first three words for example - Software is data. . . well MY software executes - it is not just data ;) . . .
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Okay, i'll explain.
It's data, you can't deny that but Executes.. well does software need to be executed to be software, you may ask yourself? No it's built for execution. To go into lowlevel description It's instuctions for the processor, data of two types; instruction identification and memory address, that's data isn't it? In programming terms, software derives data, and implements the ability to execute. Whether the software is bad or good, short or long, it's still software, which is data, you can rename any file type .exe it will execute but it probably will malfunction, but it's still a malfunctioning software. It is how the observer defines to use it.
I know this is a very obvious issue but you demanded me to ******** it and here we are :) But don't forget the rest of what I said, besides this example what more?
Re: Re: Re: Re: Re: materialism
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Originally posted by kedaman
I have a problem and I also have limited time,
I know it must be annoying (because you have limited time) but can I ask why you have limited time (Essay?, ECT?, Death?, Boredom?) - as it will affect the depth and type of answer . . .
if you are trying to derive a subjective truth without reference to what is already known (as I gathered by looking at one of your recent threads) then I'm afraid that by the very nature of thing only you can get there and no-one else can really help you ;)
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Originally posted by kedaman
read through tons of books, can you shortly define what conscieness is and how it is related to physical nature? If this is science, i'm going to be very thankful for what you have to say :)
Its very difficult to give a cogent and coherent coverage without the background material (. . . in the Dilbert cartoons there is a bit where a secretary tells Dilbert "Tell me everything you know about Software Engineering - I don't care if it takes all day . . .") ;) . . . well its a bit like that . . .