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Thread: Space boundary

  1. #1 Space boundary 
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    What happens if a hypothetical rocket that has unlimited fuel is released into space to always travel in one direction, where will it go? Where will the journey end, if at all?


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    Interesting question, however since the universe or anything beyond it cannot be infinate one would suppose the rockect would eventually run out space within which to travel. Though what would actually exist at the boundries beyond the universe would make for interesting speculation.


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    Wouldn´t it be beautyfull if it eventually ended up exactly where it started?
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  5. #4  
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    may be it's just infinite. But our brains are not capable or trained to perceive infinity. We have never seen/felt anything in the world which is infinite. So our brains can't imagine infinity.
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    Quote Originally Posted by Zwolver View Post
    Wouldn´t it be beautyfull if it eventually ended up exactly where it started?
    If it would end up where it's started, We should be able to receive light from our own earth right?
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    Quote Originally Posted by nikhil.gona2012 View Post
    may be it's just infinite. But our brains are not capable or trained to perceive infinity. We have never seen/felt anything in the world which is infinite. So our brains can't imagine infinity.
    No infinity is not possible on any level that humans interact with. Heres an earlier post that may help explain why.

    The idea of an infinate multi-verse or that time can be infinate can be easily and quickly disproved by the fact that if there were indeed infinate universes then everything imagineable must happen in at least one of these universes also the same goes for time, meaning that if time is infinate then everything imagineable must eventually happen at one time or another.

    Since we can imagine any number of other possible universes that would interact with our own and that where we would be aware of it, e.g aliens from another universe turning the oceans red last year, simply do not exist, as I think we would remember red oceans, then every possibility cleary cannot exist thus there cannot be an infinate number of universes or infinate time.

    This also means that everything had a beginning and will one day have an end.
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    Quote Originally Posted by Chrisgorlitz View Post
    This also means that everything had a beginning and will one day have an end.
    The Matrix .

    Though what i meant to say was, that infinity is unnecessary, if somehow the edges are the same as one point, how can you be sure, that every edge isn't linked together, and thus forming an infinite loop of our own space. And this also means that we all occupy the same space, unless there is a law where an infinitely small dot, can have a surface. It's staggering to think that infinity and zero would be exactly the same.
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  9. #8  
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    Quote Originally Posted by nikhil.gona2012 View Post
    What happens if a hypothetical rocket that has unlimited fuel is released into space to always travel in one direction, where will it go? Where will the journey end, if at all?
    Either the universe is infinite (in which case it will carry on forever) or it is finite but unbounded (in which case it will - eventually - end up back where it started).
    ei incumbit probatio qui dicit, non qui negat
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  10. #9  
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    Quote Originally Posted by nikhil.gona2012 View Post
    If it would end up where it's started, We should be able to receive light from our own earth right?
    We know that, even if it is finite, the universe is very much larger than the observable universe. So no.
    ei incumbit probatio qui dicit, non qui negat
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  11. #10  
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    Quote Originally Posted by nikhil.gona2012 View Post
    What happens if a hypothetical rocket that has unlimited fuel is released into space to always travel in one direction, where will it go? Where will the journey end, if at all?
    The journey would never end. The universe is expanding. In any directions you look the most distant galxies who's light is now reaching us have a current recession velocity greater than the speed of light, so since your hypothetical rocket cannot exceed c, even it there were some sort of hypothetical boundry you could never catch it.
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  12. #11  
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    I agree with Origin. Also, for you to return to the point at which you started you'd have to be traveling faster than the speed of light. As of right now this is not possible...
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    Our observable universe truly seems finite (13.7 billion years old) and unbounded. In that what we see is the universe when it was smaller than what it is right now, looking back in time.

    So such a rocketship, I would think, as you supposed, should end up from where it started, coming from the opposite direction from the direction it had it had gone. Traveling truly in a straight line at that. As if the distance were infinite, and yet finite.
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    Quote Originally Posted by 37818 View Post
    Our observable universe truly seems finite (13.7 billion years old) and unbounded. In that what we see is the universe when it was smaller than what it is right now, looking back in time.

    So such a rocketship, I would think, as you supposed, should end up from where it started, coming from the opposite direction from the direction it had it had gone. Traveling truly in a straight line at that. As if the distance were infinite, and yet finite.
    The ship would follow a "straight" in curved space, that is a line all observers in the universe would see as straight but which would always stay within space, which inturn is curved. I'm not sure that it would necessarily come back from the opposit direction. Space is curved, not necessarilly globular.
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    Interesting, as there are no straight lines in space... Hmm
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  16. #15  
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    Quote Originally Posted by Zwolver View Post
    Interesting, as there are no straight lines in space... Hmm
    A straight line is the path that light follows.
    ei incumbit probatio qui dicit, non qui negat
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    Quote Originally Posted by Strange View Post
    Quote Originally Posted by Zwolver View Post
    Interesting, as there are no straight lines in space... Hmm
    A straight line is the path that light follows.
    The correct term is "geodesic" - it is the shortest possible route between two points A and B in spacetime, though not generally "straight" as in "not curved".
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  18. #17  
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    I thought as a light WAVE is more of a harmonica then a straight line. But geodesic works fine for me as well
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  19. #18  
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    Quote Originally Posted by Markus Hanke View Post
    The correct term is "geodesic" - it is the shortest possible route between two points A and B in spacetime, though not generally "straight" as in "not curved".
    True. I should have put "straight" in quotes, perhaps.

    Quote Originally Posted by Zwolver View Post
    I thought as a light WAVE is more of a harmonica then a straight line. But geodesic works fine for me as well
    A harmonica?

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    ei incumbit probatio qui dicit, non qui negat
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  20. #19  
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    A strange funny guy... hehe
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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  21. #20  
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    Quote Originally Posted by Sealeaf View Post
    Quote Originally Posted by 37818 View Post
    Our observable universe truly seems finite (13.7 billion years old) and unbounded. In that what we see is the universe when it was smaller than what it is right now, looking back in time.

    So such a rocketship, I would think, as you supposed, should end up from where it started, coming from the opposite direction from the direction it had it had gone. Traveling truly in a straight line at that. As if the distance were infinite, and yet finite.
    The ship would follow a "straight" in curved space, that is a line all observers in the universe would see as straight but which would always stay within space, which inturn is curved. I'm not sure that it would necessarily come back from the opposit direction. Space is curved, not necessarilly globular.

    well no mater which way you look in our universe, looking back in time, looking to its origin (big bang theory). It is as if the center of the universe is on the outskirts of it. Like an inside out sphere on the inside, so it is unbounded.
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