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Originally posted by cognoscente
reply to post by ElectroMagnetic Multivers
I think we could define a universe as distinct region of space, which operates within the uniformity of a set of fundamental forces.
Imagine if we could just ever so slightly tweak the different values for each of the fundamental physical forces in our universe. If gravity were disturbed somehow, then all the possible configurations of matter would be so abruptly different to produce a universe that is ever so completely indistinguishable from this one.
You could imagine some kind of barrier between the universes. If you consider the prefix, "uni" in the word universe, then you could imagine a universe being a set of uniform physical constants. What exists outside this set, exists in another universe.
[edit on 6-3-2009 by cognoscente]
Originally posted by MarrsAttax
Isnt gravity real time. Look at light, it takes 8 minutes to travel to earth, but gravity is "real time" and instantaneous, there is no time lag. How do you explain that?
Gravity exerts it's force on us and hence we have weights. But the "force" exerted by the Sun on the planets, earth on moon etc results in the orbits of these bodies. Isnt gravity a force then?
This is the common sense view but in fact it is wrong. Gravity is subject to the speed of light just like everything else.
If the sun were to suddenly disappear the earth would continue orbiting the place where the sun had been for eight minutes before hurtling off in one direction. Crazy but true!
This is because gravity is the warping of spacetime around mass. The more mass an object has, the more it warps spacetime and the greater the gravitational attraction it exerts.
The usual analogy is to imagine a bowling ball on a water bed. The ball warps the rubber surrounding it so that if you were to roll a marble towards it the marble's path would be deflected. The difference is that rather than warping a 2 dimensional sheet (the bed) an object like the sun warps a four dimensional sheet (spacetime).
If you lift up the bowling ball the bed would spring back but it wouldn't be instantaneous.
If you could film it and slow it down you would see the bed spring back in a wave - the center returning to its original position before the outer edge of the 'warping'. Removing the sun would cause a similar effect with spacetime snapping back at the speed of light.
It's quite difficult to get your head round this concept, not sure I have myself.
I got all this information from 'Hyperspace' by Michio Kaku, a fantastic book which I thoroughly recommend.
Originally posted by weedwhacker
reply to post by ::.mika.::
D0 you know the concept of the Algbraeic concept of a 'Matrix' multiplied by another Matrix????
IF NOT......then, you needs to goes to schoools....and learn Calculuous....so you can discuss!!!!!!