Gawdzilla Sama
Valued Senior Member
The Error of Small Samples sits quietly in the corner.
Any specific reason that the universe must be so huge?
Billions of galaxies ans trillions of stars.
And we only live in a dust - earth.
Regarding size, "He Who Shrank" is a story about a guy injected with a serum that makes him shrink. He shrinks down until the atoms because galaxies and continues. He lands on planets and shrinks down on those to start the cycle again. After an endless number of these cycles he eventually lands on Earth.
Just on this point I was thinking recently about the speed of light from another area of my reading. The question was asked why is the speed of light the particular speed it is ie why not 10klm faster or slower...
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Easy answer: we define it to be. The speed of light is a constant, so we give it a number, and measure everything relative to it. Slightly more complicated answer: There is a mathematical explanation, although it depends on what sort of level you want to look at the question. Maxwell's equations govern the behaviour and interaction of magnetic and electric fields. A moving electric field causes a magnetic field and vice-versa, allowing the continuous propagation of a field through space. The important equations in this case are curl(B) = - µ_0 * ε_0 * ∂E/∂t, curl(E) = - ∂B/∂t where B is the magnetic field vector, E is the electric field vector, µ_0 is the magnetic constant (also called Vacuum permeability - a measure of the ideal magnetic permeability of a vacuum) and ε_0 is the permittivity of free space. t is time. If you take the curl of both equations, then substitute in the original result, you obtain a wave equation for both the electric and magnetic fields, suggesting that the fields propagate as waves. Conveniently, the wave equations immediately give the speed of the waves without any further calculation - this is equal to 1 / √(µ_0 * ε_0) µ_0 is a theoretical ideal constant and is therefore defined to be 4π × 10^-7 H m^-1 ε_0 is 8.854 F m^-1 In fact ε_0 is normally calculated from the other two, since, like I said at the beginning, it is in fact the speed of light c that is defined these days. But originally it was experimentally determined, and the speed of light does come out as expected. Quite interesting really.
Ben
Thanks for the link and interesting reading
But still there is an unanswered question, any inflation or expansion guided by any amount of finite energy must stop one day, then what?
Thanks for the link and interesting reading
But to me it seems we have discovered something which is in existence
But it does not explain why not 10 klm per second faster or 10 klm slower
Yes we have labelled it
And I guess yes we will have to be satisfied with "it is what it is and that's it, no argument"
The supremacy of physics strike again
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I could easily be wrong but I think the prevailing opinion is that the universe may just be expanding into itself.It is creating its own space as it expands and is not expanding into anything exterior to it.The most distant parts of the Universe which we can see are moving into NOTHING and because they are moving into NOTHING they are not meeting ÀNY resistance
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Yes I agree you have that spot onI could easily be wrong but I think the prevailing opinion is that the universe may just be expanding into itself.It is creating its own space as it expands and is not expanding into anything exterior to it.
There is no NOTHING to provide zero resistance
There is no Outside in the same way as there is no centre.
Hope I have picked up right on that.
^^^My take on the acceleration of the expansion of the Universe is as follows
The most distant parts of the Universe which we can see are moving into NOTHING and because they are moving into NOTHING they are not meeting ÀNY resistance
Since there is NO resistance those distant parts of the Universe are still moving, and as stated accelerating, under the explosive force of the Big Bang as per the rules of physics
In simple language - stuff will continue to move in a direction under a force unless another force acts upon it
As I contend the distant parts of the Universe are not meeting any other forces so they will just keep going
My bet is as the general density of the Universe decreases due to expansion gravity will prove ineffective in halting the expansion
The final death of the Universe will be when the density is so low that the forces holding atoms together will fail
The components of the atom will fly apart
I do not understand where your Progenitor State of Matter and Radiation fits in or even what it is
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^^^I could easily be wrong but I think the prevailing opinion is that the universe may just be expanding into itself.It is creating its own space as it expands and is not expanding into anything exterior to it.
There is no NOTHING to provide zero resistance
There is no Outside in the same way as there is no centre.
Hope I have picked up right on that.
I don't think that is correct^^^
Expansion is only between galaxy groups or clusters. It supposedly does not affect space between galaxies or between solar systems or between planets. Why would it affect atoms?
<>
I don't think that is correct
Currently the moon is moving away from Earth about 3.8 cms a year
http://curious.astro.cornell.edu/ab...e-earth-when-was-this-discovered-intermediate
Another link gives 50 billion years before it settles into a locked stable orbit
My understanding is the sun will have died and expanded to burn the Earth up before that period has passed
Sure in small pockets of the Universe some constructs are moving closer to each other. But overall those small regions do not counter the decrease in overall density of the Universe
I understand atoms will "explode" when effectively there exists a perfect vacuum
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^^^I don't think that is correct
Currently the moon is moving away from Earth about 3.8 cms a year
http://curious.astro.cornell.edu/ab...e-earth-when-was-this-discovered-intermediate
Another link gives 50 billion years before it settles into a locked stable orbit
My understanding is the sun will have died and expanded to burn the Earth up before that period has passed
Sure in small pockets of the Universe some constructs are moving closer to each other. But overall those small regions do not counter the decrease in overall density of the Universe
I understand atoms will "explode" when effectively there exists a perfect vacuum
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I do not understand where your Progenitor State of Matter and Radiation fits in or even what it is
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