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  Reply # 997406 2-Mar-2014 06:56 Send private message

Dude if you travel at light speed time stops completely. So you can go however far you want and not grow old and never have to pee or eat.

Perhaps even go back in time.

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  Reply # 997429 2-Mar-2014 08:58 Send private message

joker97: Dude if you travel at light speed time stops completely. So you can go however far you want and not grow old and never have to pee or eat.

Perhaps even go back in time.


For the person travelling at light speed, time just goes on as usual from that persons reference point.  This is why it is called the theory of relativity. 

So, you still have to and pee, luckily for your friends. 


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  Reply # 997430 2-Mar-2014 09:05 Send private message

no it doesn't. time appears to go on for that person but it relatively it doesn't. so you theoretically don't grow old. not even by one second. which means you can travel infinite distance and arrive millions of light years away at the same age when you started travel. (but everyone else you know who didn't travel at that speed would be dead). I'm not sure if you still need to pee. time freezes. theorically you can even go back in time.

but unfortunately unless someone can overcome physics you can't theorically travel AT speed of light. unless you're spock

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  Reply # 997437 2-Mar-2014 09:14 Send private message

here's the lay person explanation. specifically read the twin bit.

please indicate when writing opinion instead of facts

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  Reply # 997438 2-Mar-2014 09:14 Send private message

here's another slightly simpler explanation. see Einstein and relative time section

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  Reply # 997440 2-Mar-2014 09:19 Send private message

the time/lightspeed theories are not proven.




Mike

 Interesting. You're afraid of insects and women. Ladybugs must render you catatonic.

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  Reply # 997442 2-Mar-2014 09:23 Send private message

joker97: here's the lay person explanation. specifically read the twin bit.

please indicate when writing opinion instead of facts


Time certainly does not stop for the person inside the spacecraft so they still need to pee. Your original statement is still very wrong. 

Your problem is you did not explain yourself clearly and you missed the 'relativity' bit out of the theory of relativity. 

Please do not provide vague statements!!!!!!!!!!!!!!!!!!!!!!

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  Reply # 997443 2-Mar-2014 09:28 Send private message

Athlonite:
Fred99:
KiwiNZ: A problem we have is we only know the very distant past of the universe and a very small snap shot of it, we have no real idea of the present except in our little piece of it, and that is a very small number. So assumptions and calculations are done based on events billions of years ago and trying to fit them into our model. However the reality is the Universe may well be very different to what we now believe.  So to look for life in other places in the present is looking back, way back in time. That gives so much scope for so much to be very wrong.




In terms of looking for evidence of life in other places, looking in our Milky Way galaxy would be a sensible place to start.
And it that case, despite the scale being immense - it's actually a pretty small spot in the universe.  The galaxy is only 120,000 ly or so.  120,000 years is tiny fraction of the period of time that life has existed on Earth.
Within our galaxy there would appear to be over 10 billion candidate stars with "goldilocks zone" planetary systems.
Many are much closer than ~100,000 ly.
Remote sensing for evidence may be difficult - but look how far we've got in the past few decades.


please don't confuse Light years with normal years they're two completely different beasts a light year is the distance travelled by light in a vacuum for one earth year  

1 Light Year = 9,460,536,000,000 km so bloody long way or 1135264320000000000 Km across and you'd need to be doing light speed just to make it across in 120000yrs 

So unless we can figure out a way to travel many times the speed of light your children's children's children's children's children will most likely still only be able to make it to the edge of our solar system 


I'm not "confusing light years with normal years".  Not coincidentally, as well as being a measure of distance, a ly is a measure of time - the fastest time (as far as we know) that information may be exchanged between two points.
We don't necessarily need to travel at all to find evidence for extraterrestrial life.
If we wanted to go there to collect a sample, then sure - we've got a problem.



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  Reply # 997461 2-Mar-2014 09:46 Send private message

surfisup1000:
joker97: Dude if you travel at light speed time stops completely. So you can go however far you want and not grow old and never have to pee or eat.

Perhaps even go back in time.


For the person travelling at light speed, time just goes on as usual from that persons reference point.  This is why it is called the theory of relativity. 

So, you still have to and pee, luckily for your friends. 



If you travelled a litte faster than the speed of light, you will be invisible. You will still be there, but the light from you, won't

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  Reply # 997464 2-Mar-2014 09:52 Send private message

surfisup1000: My point is that the universe expanded faster than the speed of light  -- but it was space expanding as opposed to actual speed as we know it. Maybe the same physics behind expansion can one day be harnessed to travel faster than light. 

Hopefully they discover this before all the atoms in the universe fly apart due to the accelerating space-time expansion. 




The "universe expanding faster than the speed of life" is a generally misunderstood.
The universe only needs to expand at 1/2 the speed of light (so break no rules) for the most distant objects in it to "disappear" beyond an event horizon.  The relative velocity between points can be greater than the speed of light - when the expansion velocity is not.
This is probably happening.  The amount of red shift in the most distant objects from us, combined with the observation that the rate of expansion of the universe may be increasing and the rate of that increase, means that those distant objects have probably already "left the room" - they no longer exist from our point in our universe.  We can still see them only because we're seeing light from when they still were there - billions of years ago.

Speculation that the expansion velocity may have at times exceeded the speed of light is just that - speculation.

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  Reply # 997467 2-Mar-2014 09:55 Send private message

forgot to add. if anyone wants concrete layperson explanations on theoretical physics head straight to the library and get a book called

The Beginning of Time by Stephen Hawkings

Contains all the grounding and foundation of theoretical physics and no complicated theories. I don't recommend reading any other books until you understand this book. In fact I don't recommend any other books as the theories are far beyond any normal human's understanding. The proofs etc is so complex it takes decades to comprehend for a normal human like me. I'd go to the internet for those.

But - read this book. Not very long, very excellent value for money if you want to have solid understanding of your space times :D

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  Reply # 997469 2-Mar-2014 09:58 Send private message

KiwiNZ: the time/lightspeed theories are not proven.


They're sufficiently confirmed by observation to create the need to compensate for the effect (calculated using the parameters suggested by the "theory") for things in ordinary daily use, like the clocks in GPS satellites etc.  Observed many times in many ways.

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  Reply # 997493 2-Mar-2014 11:58 Send private message

Dratsab:
garbonzai: until someone named Scotty invents the Warp Drive, it's all theory, what's in our mind and what we choose to believe.

"Scotty" may be a little closer than we think if the reports on sites such as thisthis and this are anything to be believed.


If only.
If we actually observed some phenomenon (which wasn't false - a mistake in observation) showing that transfer of information faster than light speed could happen, then yeah...

A Bugatti Veryon could achieve light speed in about 10 months, if newtonian physics only applied, if the rate of acceleration which can be achieved for the first couple of seconds could be maintained for 10 months (and didn't decline the faster it goes - as of course it does).  Tyre replacements at $50,000 a set every 4,000km or so would require an enormous budget and a very slick pit crew - especially when needing to do 75 tyre changes per second once the speed was getting up there. In reality, it would need a flux capacitor - just like a DeLorean.

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  Reply # 997761 2-Mar-2014 20:19 Send private message

Our universe is expanding but also accelerating (which does not line up with our thinking about a singular big bang which would not accelerate matter after the fact). So I wonder if we are not being pulled by a force other than gravity. Perhaps if we are only seeing the old light, perhaps we are being dragged by a force that no longer exists also ? 

We get life on earth in the strangest and most hostile of places extremophiles in ice, at high temperature, high pressure etc. So it would not surprise me if we found life in our own universe or perhaps rudimentary life on mars. It would seem an unfathomable coincidence to think that life was exclusive to earth. I'll have to google it and find out :)   

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  Reply # 997788 2-Mar-2014 21:10 Send private message

turnin: Our universe is expanding but also accelerating (which does not line up with our thinking about a singular big bang which would not accelerate matter after the fact). So I wonder if we are not being pulled by a force other than gravity. Perhaps if we are only seeing the old light, perhaps we are being dragged by a force that no longer exists also ? 


if you push something in a vacuum at an constant rate it will speed up you just have to remember that the initial outward force of the big bangs shock wave is still travelling outward  




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