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Can't look back in time

Can't look back in time - Physics Forum

Can't look back in time - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 10-08-2008, 02:56 AM
AllYou!
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Default Can't look back in time



In
news:[Only registered users see links. ],
BURT <[Only registered users see links. ]> mused:

What the hell is "return time"?


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  #2  
Old 10-08-2008, 12:16 PM
AllYou!
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Default Can't look back in time

In
news:[Only registered users see links. ],
BURT <[Only registered users see links. ]> mused:

And why is the basis of the age of the universe limited to what we
can see of it? What about what we can't see of it?


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  #3  
Old 10-08-2008, 12:29 PM
jmfbahciv
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Default Can't look back in time

AllYou! wrote:
I suggest that you cross a busy street without using time.

/BAH
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  #4  
Old 10-08-2008, 12:42 PM
AllYou!
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Default Can't look back in time

In news:[Only registered users see links. ],
jmfbahciv <jmfbahciv@aol> mused:

We all do that. We compare our motion to the motion of the vehicles
in the street, and make our decisions accordingly. The fact that we
call that comparison of motions 'time' proves that it's just an
intellectual concept. That's how we came to invent time. We took
what we believed to be a regular, predictable motion, and compared
all other motions to it, and we pronounced it 'time'.


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  #5  
Old 10-08-2008, 07:50 PM
rustyjames777@gmail.com
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Default Can't look back in time

On Oct 8, 5:42*am, "AllYou!" <[Only registered users see links. ]> wrote:

The metric expansion of space can not exceed C, but even if the
expansion is at C we could not have calculated the beginning of time
or the big bang correctly because some light would never reach us to
judge red shift correctly for proper dating of the universe if space
time is expanding at c in all directions its like running on a tred
mill going in the oppisite direction if its moving at C and your
moving at C you never reach your target
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  #6  
Old 10-08-2008, 08:41 PM
Sanforized
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Default Can't look back in time

[Only registered users see links. ] wrote:


Nonsense.

It isn't that far off from the dot on the oscilloscope
screen that can be made to "move faster than c." Of
course the dot isn't moving at all, the beam is
repointed elsewhere. Similarly "space" can be filled
in in a way that makes things appear to move apart
at rates greater than c while they're actually moving
at rates lower than c.

So is the imposition of new space between galaxies the
same as relative motion? Given that attraction between
bodies, and clusters of bodies, decreases as the square
of the distance, imposing new space between two galaxies
has such effects.

Don't hurt your brain thinking about such things.










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  #7  
Old 10-08-2008, 10:20 PM
AllYou!
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Default Can't look back in time

In
news:[Only registered users see links. ],
BURT <[Only registered users see links. ]> mused:

How do you know that we can see to the edge, regardless of which
direction we look?


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  #8  
Old 10-08-2008, 10:36 PM
RustyJames
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Default Can't look back in time

On Oct 8, 3:20*pm, "AllYou!" <[Only registered users see links. ]> wrote:

exactly their is no edge on a closed manifold thus we will never see
the edge of the universe dark flow moves around the closed manifold
where their are no boundries
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  #9  
Old 10-08-2008, 11:26 PM
Sanforized
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Default Can't look back in time

AllYou! wrote:


He very clearly used the word "believe." He doesn't know.


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  #10  
Old 10-08-2008, 11:36 PM
holog
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Default Can't look back in time



Sanforized wrote:




c is the limit at which we in this 3d area can record.


holog


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