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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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What's on the outside the Universe? Answer: Nothing. There is no outside of the universe. The universe is. Outside is not. The universe is not expanding [b]into[/b] anything. It is simply expanding. What does the edge of the universe look like? Answer: Technically you would never be able to reach the edge of the universe as it is expanding at the speed of light, faster than it is possible to travel, so you could never actually catch up to it. Even more technically to be able to see it would require photons reflected back off the edge into your eyes. As there is no edge nothing can reflect off it. However assuming you found a way to travel faster than light, you would never be able to reach the edge of the universe anyway. Travel far enough in one direction and you'll simply come back to where you started. Think of it like the surface of a balloon. The balloon can expand but if you travel on the surface of the balloon you'll simply go round in a circle. Are black holes, wormholes? No. Black holes are supercondensed remains of a white dwarf star. The gravity is so strong that the escape velocity is beyond the speed of light. Therefore even light gets sucked down making the 'hole' appear black. Wormholes are something else entirely and can be explained by string theory (don't ask). However wormholes only occur within this universe not between entirely seperate universes. Dark matter and dark energy? Even physicists have no idea. Definition: Matter that is undetectable by any means other than the fact without it the universe would be about 70% too light. Dark energy is the same for energy. For the those in the know dark energy has been proposed as Einsteins universal constant.
