1. ok heres something iv been pondering on. If Einstein states that space and time are unified (Space-time) and that space time is expanding (making time run forward), does this mean that, should the theory that says eventually gravity will overpower the expansion of space time and pull everything back down to a singularity?

2.

3. Don't take my interpretation too literally, but here is how I see it:

As everything expands and time moves forward, gravity remains constant. Gravity is relative, if everything is expanding there won't be any imbalances in gravity.

4. It all depends... if the universe is accelerating or deaccelerating (is that correctly spelled?).

1) If the universe accelerates, gravity is already part of this system and the universe won't collapse into a singularity.

2) If the universe expands but with negative acceleration, some day it'll be 0 and then everything will start to come together again right?

5. Originally Posted by Nima Rahnemoon
As everything expands and time moves forward, gravity remains constant. Gravity is relative, if everything is expanding there won't be any imbalances in gravity.
keep in mind gravity decreases as things go farther out....

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6. hmm, well... If the universe is expanding, then everything in the universe is also expanding. The mass of everything grows, but in relation to one another the mass is still the same ratio.

Using Newton's Law of (I think it's called) Universal Gravitation:

Force = (km1m2)/(d^2)
m1 = mass of object 1
m2 = mass of object 2
d = distance between object 1 and object 2
k = some constant...

As the universe expands nothing changes. The masses both grow, the distance grows and the constant grows.

And...

"Negative acceleration"? Do you mean that after the big bang everything has been condensing rather than expanding? Interesting, never thought of it that way.

7. Originally Posted by Nima Rahnemoon
"Negative acceleration"? Do you mean that after the big bang everything has been condensing rather than expanding? Interesting, never thought of it that way.
With "negative acceleration" I ment decreasing speed. That means that the expansion of the universe will cease som day, and it'll start to condense back into a "big crunch".

8. Originally Posted by Cuete
Originally Posted by Nima Rahnemoon
"Negative acceleration"? Do you mean that after the big bang everything has been condensing rather than expanding? Interesting, never thought of it that way.
With "negative acceleration" I ment decreasing speed. That means that the expansion of the universe will cease som day, and it'll start to condense back into a "big crunch".
the "big crunch" would turn into a mega black hole, and there would be a big bang all over again. this is never-ending.

9. Originally Posted by chicken_boy
ok heres something iv been pondering on. If Einstein states that space and time are unified (Space-time) and that space time is expanding (making time run forward), does this mean that, should the theory that says eventually gravity will overpower the expansion of space time and pull everything back down to a singularity?
I would like to introduce the possibility of time expansion, as opposed to moving forward: and this of course is a separate discussion by itself.

Considering gravity and the ebb of life within the order of things It seems probable that after sometime of expansion, if gravity does not weaken ? that every thing would contract, just as we ourselves breath, in- essense the universe has its breather ...perhaps repeats this scenerio after collapsing starting with the big-bang once again, and again..... I think this therory has already been realized hypothetically, but it is also interesting to consider if this is the way the universe goes about it's bussiness: would not time reverse itself?at least in the order of things , would everything than be moving backwards? I read somewhere, that if everything were to be moving in reverse - order { actually was refered to as 'time moving backwards', we would not notice the difference. In this case: The flip side being: Excistence as its 'now' taking place in an expanding universe: from a grander view; is this any less backwards ? Any other speculations or equations that support this, or coments of otherness?

10. Right, I have seen a lot of old discussions being resurrected in my day, but this one certainly takes the biscuit.
This thread is six and a half years old ??!!!? Why are you posting on here ??

11. Originally Posted by chicken_boy
ok heres something iv been pondering on. If Einstein states that space and time are unified (Space-time) and that space time is expanding (making time run forward), does this mean that, should the theory that says eventually gravity will overpower the expansion of space time and pull everything back down to a singularity?
Actually it is expanding and it's getting quicker. Space is expanding faster and faster and maybe to the point it travels so fast maybe light might not be able to keep up.

12. Originally Posted by NimaRahnemoon
Don't take my interpretation too literally, but here is how I see it:As everything expands and time moves forward, gravity remains constant. Gravity is relative, if everything is expanding there won't be any imbalances in gravity.
What Einstein meant that if you can bend space into let's a worm hole then time could be bent with space. Search on google for a picture on a worm hole. If you use current logic to try and understand this; you will confuse yourself.

13. Plus you also have to think about the strong nuclear force. Atoms would want to spread out as well. Meaning the nuclei will have stress.

14. Originally Posted by PhysicsApple
Plus you also have to think about the strong nuclear force. Atoms would want to spread out as well. Meaning the nuclei will have stress.
The strong nuclear force keeps the nucleus of the atom together, not want to spread out.

And you are responding to six year old posts.

15. It still worth thinking about.

16. When people say that the universe they mean the it is not a spread out. Due to the fact of gravity. The universe is expanding and it's getting faster.

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