# Time machine possible or impossilble

saltydog
Homework Helper
I think traveling back in time is impossible on dynamic grounds: The universe is a big non-linear dynamo in its chaotic regime. Think of the Lorenz attractor: trajectories NEVER cross. If the universe is like this, then going back in time would amount to "crossing" trajectories. But the universe does not seem to have this property. Rather it is fractal, non-linear, dense (no smallest small or largest large), and chaotic (think of the orbit of the earth: it's not a clean ellipse but rather a torus). Everything in the universe seems that way: nothing clean, always messy, chaotic, dense and non-linear: just like the Lorenz strange attractor.

So I'm no Einstein but sometimes I imagine ridding on a trajectory in the Lorenz attractor and wondering what I'd see? I think I'd see my world expanding all around me wouldn't I?

thanks Mr jcsd for the link
as for Mr Robosapien, thanks for calling me mr optimistic while i am not at all
but in thoe matters i really am.
first of all i would like to say i am just a beginner in this field (astronomy, metaphysics.. ) but i believe somehow: "there are too many ways to arrive to you aim, it just needs too many ways of thinking and reasonning"
while about your way, i would like to listen to a specialist to see wether it can be made or not. i'm not talking about how long it will take; i'm talking about its "possibility"

Science is our future :)

iof the time machine only travels in time and not space, then it is likely you will appear with either far out to space or deep under the crust of the earth, if, however it does exist in the time you are travelling to chances are it will take you to the machine in that time and not just spawn you according to the bigger picture...

well i think if we will be able to build a time machine; it will be for moving us in space and time; because whenever you move in time u r moving in space (space is not constant)

chroot
Staff Emeritus