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Author Topic:   Time, a brief history
Posit
Inactive Member


Message 3 of 62 (297009)
03-21-2006 7:51 AM
Reply to: Message 1 by sinamatic
03-20-2006 5:35 AM


Did the universe begin as a vastly dense singularity billions of years ago, or with God's immortal words just some thousands of years ago?
Or maybe a vastly dense singularity sprang into existence billions of years ago at God's immortal words.
Brokenpride writes:
How could you start at negative infinity and climb to 2006? Even if history repeated itself I felt that we would still be at a certain number of repetitions. Another way of explaining it, is if all matter had to react with itself to reach the form it is at today it could not have been forever reacting in history.
It makes far more sense to me to believe the bible and accept that the universe was created by God. When God created matter and the laws of physics and time, history, weight, velocity and all other measurements could now be measured.
The universe springing from a timeless God seems no easier to explain than a universe springing from a timeless void. It's an additional complication. Now you not only have the concept of timelessness to explain, but the concept of God as well.
Brokenpride writes:
Everyone knows that light bends. How do we know that we aren't looking at our own sun's light thinking it's another star. Is it possible that light from the sun could be bending around a giant sphere until "wow" we can see it with our telescope? That's a bit extreme but ever notice how all the stars of the milky way are printed on paper. I wonder what the three dimensional picture would look like?
It's still an open question whether the universe is gravitationally closed or not. Even if it, however, light from the Sun, or even our galaxy, would be incredibly faint by the time it circumnavigated the universe and got back to us. Not only that, but the Sun would be a slowly cooling white dwarf by then.
Brokenpride writes:
After all when we are looking at stars billions of light years away how do we know that the image didnt come from an entirely different direction? Perhaps the whole universe is one big sphere with light bouncing in from the border. -just a thought
Perhaps, although two obvious questions arise:
1. What's the sphere made of?
2. What's outside?
Thinking up new speculative models is fun. Making models that explain observations better than existing models--therein lies the rub.
This message has been edited by Posit, 03-21-2006 07:53 AM

This message is a reply to:
 Message 1 by sinamatic, posted 03-20-2006 5:35 AM sinamatic has not replied

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Posit
Inactive Member


Message 41 of 62 (297999)
03-25-2006 3:01 AM
Reply to: Message 35 by sidelined
03-24-2006 2:23 AM


Re: Time to discuss theories
sidelined writes:
Imagine yourself on a train moving at a constant velocity past a railway crossing. You open a window and take rock and drop it from the train. Now, ignoring air resistance, on the train you observe the rock to follow a straight line path to the ground.
On the ground outside the train a person watches you perform this misdeed and observes the rock to follow a curved path {Parabola} to the same point on the ground.
I've never heard this one before. Odd that Einstein would use it, since it's explainable with introductory Newtonian mechanics.
Now if the train were moving at a hair under the speed of light, and a guy on the caboose shined a flashlight backwards, would the stationary observer see a very slowly moving beam of light? That is a more Einsteinian thought experiment.

This message is a reply to:
 Message 35 by sidelined, posted 03-24-2006 2:23 AM sidelined has replied

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Posit
Inactive Member


Message 50 of 62 (298548)
03-27-2006 7:21 AM
Reply to: Message 46 by Son Goku
03-26-2006 6:13 PM


Re: Spacetime Geometry
Son Goku writes:
Now we have a 4-D plane with a x axis, y axis, z- axis and a t-axis.
Any point can be labelled with four numbers (x,y,z,t)
So far this is the same as when every dimension is a spatial one.
Now what is the distance between two points in this plane.
It turns out to be:
ds^2 = dx^2 + dy^2 + dz^2 - dt^2.
Where dt is the difference in the time values.
Compare this with the distance formula for four spatial dimensions above:
ds^2 = dx^2 + dy^2 + dz^2 + dw^2.
Very interesting. Of course, you left out the little detail of units.
What do you get when you subtract 10 seconds from 2 meters?

This message is a reply to:
 Message 46 by Son Goku, posted 03-26-2006 6:13 PM Son Goku has replied

Replies to this message:
 Message 51 by Son Goku, posted 03-27-2006 7:42 AM Posit has replied

  
Posit
Inactive Member


Message 52 of 62 (298568)
03-27-2006 8:14 AM
Reply to: Message 51 by Son Goku
03-27-2006 7:42 AM


Re: Spacetime Geometry
So two events occurring 300,000,000 meters distant and one second apart have zero distance between them, even though they are at different points in Minkowsky space?

This message is a reply to:
 Message 51 by Son Goku, posted 03-27-2006 7:42 AM Son Goku has replied

Replies to this message:
 Message 53 by cavediver, posted 03-27-2006 8:31 AM Posit has not replied
 Message 54 by Son Goku, posted 03-27-2006 9:06 AM Posit has not replied

  
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