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Originally posted by forgiven:
ok, i'm getting there thx...
I aim to please.
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am i correct or not in assuming that this "size zero" is known to be so?
If you mean to ask if this is observable, then the anwser is "no." In fact, there is a brief period of time between now and then when there wasn't any light-- the proper subatomic particles had not yet formed. Since all we have to go on is light, we can't see further back than that point. If I am not mistaken there is some effort being made to peer beyond that point using gravitational wave detectors. I could be confused on that though.
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iow i guess i'm asking how we know the "size" of the singularity...
Its observation and extrapolation. The universe is expanding very quickly in all directions. Throw that in reverse and you end up with everything in one place. Then consider what is known about gravity and about atomic nuclei. Gravity increases with mass and distance from the center. The more massive something is the stronger the gravity. Also consider that the gravitational force increases with the square of the distance from the center. The more dense an object is the closer your are to the center, hence the gravitational force is stronger. As the universe shrinks (our film being in reverse) these forces crush the atomic nuclei, then the subatomic particles. Size continues to decrease, gravity continues to increase. Size goes to zero. Gravity goes to ∞.
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if this is so, and i'm not saying it is, then whatever exists now (in its present form with its present shape, size, etc etc) existed before bb
At best, all you'd have is infinite energy, certainly not everything "in its present form with its present shape, size, etc etc."
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