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9/25/2005 2:06:21 AM
133
What's on the outside of the universe?
Seriously, though? Whenever I look at the sky, I always wonder: what is on the outside of our cosmic bubble?
The universe expands at a rate of around 1 trillion trillion trillion light-years per second. It would take one heckuva rocket engine to get to its end.
But here's another random thought: compare the universe to a rubber band; when you pull it, it stretches. Like how our universe expands.
...But when you let go, it INSTANTLY snaps shut. My point is, if the universe were expanding, chances are its contraction would be around a 1000 times faster, so we'd never feel it.
Back on track: what is on the outside of our universe? It's like a video game: there's an invisible wall. There is another side. But you cannot reach it. If you try, your character dies.
It's impossible to imagine nothing on the outside of a barrier. What is outside the universe's boundary? What does that boundary look like? It freaks me out just thinking about it; like humanity isn't ever supposed to know the answer. Try it: try thinking of an "outside" to the universe. It will give you a headache.
What's preventing us from imagining the outside of the universe???
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[quote][b]Posted by:[/b] Jordan117 [quote][b]Posted by:[/b] free tibet The universe could be a 4-dimensional sphere, in the same way that the Earth is a 3-dimensional sphere. If you keep traveling in one direction, you would end up in the same 4-dimensional place, i.e. the same point in time. Just as if you were to travel around the Earth in one direction, you would end up in the same 3-dimensional place that you started from. [/quote] Here I go switching positions again... Thinking about this theory, you have to ask yourself: what is inside that sphere? Or outside of it? Is it a 4D space? Is it nothing? That's one of the interesting things about a theory called Brane Cosmology. It says that our whole universe is actually a 4D membrane floating through a much grander 11D multiverse, and that there are countless other universe-membranes floating in this multidimensional space with us. It also says that the Big Bang occured because our membrane collided with another one... mind-boggling stuff... [/quote] I find the idea of membranes very useful in visualizing this kind of thing. We live in a 3 dimensional universe. To represent this, imagine stepping back a dimension, so our 3-dimensional universe is represented by a 2-dimensional membrane, and time (the 4th dimension) is represented by 3 dimensions. According to Einstein, gravity is caused by large masses creating a 3 dimensional dent in our 2D membrane, therefore drawing in matter around it. A black hole would create a hugely steep and deep dent in our membrane that no matter or light or even space or time could escape from. If there are parrallel universes (represented by more 2D membranes side by side, like the sheets of paper in a book), and supposing there was matter so dense that it made a huge dent in space and penetrated the next universe. This would be a "super hole" and due to the process of diffusion, the matter from the membrane universe with more matter in it would flow through the hole and into the next universe. This would appear in the next universe as a "white hole", or, to express it another way, a huge explosion of matter, space, time and light from a small point. Sound familiar? Now, supposing the membrane universes were connected like a roll of tape in a huge loop, this would mean that time is infact a loop, that continues infinitely. A "super hole" connected to 2 places in the loop would cause matter transfer through time, for example matter/time/space/light would flow from the time of the "big crunch" (if it happens) to the time of the big bang. This would effectively mean that time travel is possible. What do you think?
