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if you got a hold of a time machine, what would you do?

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Howard_Casto:
While I don't think human time travel is possible (again if it were we'd see buttloads of "time tourists")  time is indeed a physical thing and any physical thing is definite enough to revisit. 

The problem with time is physicists are talking about actual time, which is a property of space (spacetime) while lamens are talking about the PERCEPTION of time, which is drastically different. 

Example:

People can't seem to get a grasp on the concept of gravity.  This is due to our limited perception of gravity.  If you are standing in a field gravity is a "thing that makes things fall down"  If you point to a globe gravity is a "thing the makes things pull towards the center". 

What gravity actually is, is a warp in space time around an object due to it's mass.  Think of pressing a marble in the mud.  Now pour water in the general area of where the marble is and it will feverishly wick in the tiny gap between the marble and the mud, trying to fill the void in the space.  This is more how gravity ACTUALLY works. 

And now that you can see gravity as a physical thing, the theory of realitivity is much easier to grasp.  Time operates differently the further away you get from the earth because you are slowing pulling yourself out of the spacetime void around the planet. 


And with that, my brain just overheated... nap time!

AtomSmasher:
Gravity is just a theory, no ones been able to prove it actually exists :)

ark_ader:

--- Quote from: Howard_Casto on December 16, 2011, 11:44:22 pm ---While I don't think human time travel is possible (again if it were we'd see buttloads of "time tourists")  time is indeed a physical thing and any physical thing is definite enough to revisit. 

The problem with time is physicists are talking about actual time, which is a property of space (spacetime) while lamens are talking about the PERCEPTION of time, which is drastically different. 

Example:

People can't seem to get a grasp on the concept of gravity.  This is due to our limited perception of gravity.  If you are standing in a field gravity is a "thing that makes things fall down"  If you point to a globe gravity is a "thing the makes things pull towards the center". 

What gravity actually is, is a warp in space time around an object due to it's mass.  Think of pressing a marble in the mud.  Now pour water in the general area of where the marble is and it will feverishly wick in the tiny gap between the marble and the mud, trying to fill the void in the space.  This is more how gravity ACTUALLY works. 

And now that you can see gravity as a physical thing, the theory of realitivity is much easier to grasp.  Time operates differently the further away you get from the earth because you are slowing pulling yourself out of the spacetime void around the planet. 


And with that, my brain just overheated... nap time!

--- End quote ---

I thought it was your nap time after the first sentence.  :P

I have to admit I have time traveled into the past before and it is no big thing.  There are side effects to this process, like feeling tired, cranky and with a slight back ache.  These symptoms disappear after a few minutes walking.

If you were lucky enough to fly Concorde from London to New York you were in effect traveling back in time. 

Now its time for my nap.  ;D

Howard_Casto:
Lame jokes aside my whole paragraph apparently went completely over your head.


You traveled back through a perception of time, not through time.  Timezones and international date lines have nothing to do with actual time.  Those constructs are put in place to measure the amount of sunlight left on a perticular location in a given day, not the passage of time. 

jennifer:

      It look"s like Im somewhere over the Florida coast.... Things don"t seem as they should...

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