walk up to the end?????

[trapit]

Let us consider we are having a vehicle than can attain any great speed;in multiples of light speeds(supposing we overcome the effect of mass law that weight becomes infinity at light speed).Now let us travel through the universe starting from the north pole.
Can we reach the end of the universe?Can we move constantly in a same direction?Can we make sure that we dont trace a path twice?And if we suppose that we find an end what will be there a metre after the limit???????

[kamil]

Well that all depends if the Universe does have spatial boundaries. If it does, then moving at the speed of light will make one end of the Universe right next tothe other, from your perspective. In other words the Universe would be two dimensional. This is because of length contraction. THough suprisingly the car would be longer than the Universe, since its length is not affected.

Actually, i just thought, if the UNiverse had no spatial boundaries, then its length would be infinte. Apllying that to the length contraction formula gives:

L'=inf*0

The length of the Universe would then be infinte multiplied by zero.

[sergey500]

I agree with Kamil, we don't know if the universe has boundries or not, we don't even know what shape it is if it does have boundies. My best bet it would be rigdy cricle, very deformed still spreading.

If what I said is indeed the case, the unvirse is a cirlce, that would mean we can reach the end. There are no real boundies, if you fly out of the unvirse, my guess is you would end up in nothingness and your life will end/stop, since time and space doesn't exist, no time meaning your frozen for all of eternity, no space meaning you can't move, can't see, you're done for.

Another scenerio can be is that at such immense and improbable speeds you can rip the fabric of space and create your self a wormhole or black hole....you get sucked in. What happens after is another question, what happens in a black hole? But we can get to that later.

But saying the universe is shapless and infinite (which i doubt) then you will be simply flying forever...and ever...and ever. Send me a post card when you reach something interesting.

Yet something i feel like i should point out, if the way i said it is right, its sphere, than...there is no north pole. I believe the universe is made out uniformed energy, if this is true, there is no poles to begin with.

Hope this helps. I am sure infy has something intereseting to say or some other moderator, they always have something interesting to say.

[Tarantism]

personally, i dont want to reach the end of the universe. i dont want to see it. i doubt that the human mind at this point in our evolution could even come close to comprehending what is there, if an end were to exist. too much man, too much.

regards,
tarantism

[trapit]

I dont understand the way we guessed the shape of the universe is spherical.Because sphere is a body coming out of three dimensions.We cant exactly say that there are only three dimensions.
seconndly i was in doubt about the fact that there will be no space and time after a certain limit.How can it be?May be we can say that the stars and other bodies we see will exist for a limited space(Because the total energy and hence matter of the universe is constant).But what about the null space?????

[sergey500]

Simply enough...we don't know. So far no one can say with certainty if the universe is infininte or not. WHy some people, like me believe in sphere (not a perfect sphere, but more round than square), is because when the big bang exploded. It pushed things out ward. When you blow something up underwater or blow something up in space, what shape do you get? a sphere. So we can assume that this sphere (it could have deformed) still is ever so expanding.

I am sure i got a few points wrong, I am not expert but thats the jist of why most of us believe its sphere. If indeed most of us believe ithe universe is limit. (other wise in quantum mechanics, the multiverse idea would be quite impossible, because as i figure, infinty was stretch over every parrarel dimmension).

Um, no as we see it now, we have 12 dimensions. Orginally 11 but with string theory ( m-theory) we get 12. What I personally assume, apperently some people think otherwise, is that whatever is true for last dimension will be true for next. But next will have extra properties. So seeing how the universe is 3D we can safely assume that the sphere is it in is indeed a sphere (which is 3d)....I suck at explaining this....

Null space? You mean the nothingness outside of our universe? Well assuming that the universe is limited, I should be able to conclude outisde it there shouldn't be anything, an opposite of the universe. Nothingness doesn't exist in our universe, because nothingness is nothing, outside our universe things are different. Properties and laws don't exist, no space/time, no nothing. Blankess.

There is high chance i am wrong, I am simply giving my idea of how this thing works. BUT then again, there is no way i can be wrong. This non conclusive area of science, so far, we don't have any proof for any idea. So until one prooves otherwise my ideas are just as solid as any theory out there.

[trapit]

Hey sergy,one thing,big bang only says that the materials(i mean the matter)in the universe started expanding,like stars and other heavenly bodies and all other particles(and hence the group of particulate in the universe may be spherical).But u see these bodies must have enough and more space to expand.This space(as i said-null space)was not created at the big-bang.It was existing before that.When the expansion continues the thing happening is only exploring new areas of space.My question was;will this exploration end or will there be a state that the materials of the universe can't expand or move anymore??

[sergey500]

As I see it, there is no limit, nothingess is nothing, null space is nothing, there is properites, so there is no measurement of how much our growing universe can consume. But our universe will stop growing not because it ran out of space, but because it has too much space. There are many theories on this, i will just pick one. The big crunch, the opposite of the big bang. The theory basicly says that the universe will implode on itself due to it own gravity, so it will collapse on itself.

[trapit]

Well,so i must understand there is no possible endpoint of the vast universe.

Another thing i asked was that Can we identify ourself as moving in same direction or can we make sure that we are not tracing the same path again and again?

[Tarantism]

woo there is a suggestion! perhaps when you reach the end of the rainbow you simply could pop out of the other side!...anything is possible...