Define Time. What exactly is Time? How do we measure Time?

I believe the answer to those question is important for the argument of FTL travel.

If I am in Earth (or any other place) now standing still, then suddenly I move to Mars at a FTL speed, will I arrive in Mars before I left Earth? Will I see myself on Earth while I'm in Mars?

What if I got a twin, we are both 15 years old now, I suddenly start moving at FTL speeds for 40 years, My twin do not. After the 40 years, will I be younger or older or the same age than my twin? Will he be a 55 years old man, while Ill be a 35 years old man?

Personally I believe that at this time we cannot conceive an idea of how Time behave at FTL speeds. Just like a child cannot conceive how by burning coal we obtain electriticy, for example, or how are babies formed.

To some observers (but not yourself), you will arrive at Mars before you leave Earth.  Unless some frames of reference are "special", the person observing you as arriving at Mars before you leave Earth will be factually accurate in their observation.  Nor will they be restrained by the hand of God from abusing this observation to create paradoxes.  Nor will you be restrained from using this frame of reference to return to Earth before you leave Earth.

Do the math.  For the love of God, do the math.  You can claim the great mystery of the unknown to obscure your ridiculous ideas, or you can use the equations which we actually have to solve problems like this.  Forget about time, forget about the relativistic effects on the superluminal frame of reference, forget about twin paradoxes.  Just look at causality.  If your analysis doesn't yield the same results as mine (and the rest of the scientific world), you've done something wrong.

-Dr. B

Lol, you are no scientist. A real scientist would know, do not depend on math, use your imagination, imagination is better than math. There a high probability (thats right, probability) that the mathematical equations are incomplete  and also a higher probability that any assumptions we make to establish and solve the equations will lead to a wrong answer.

And I do not even have to know what equations you use to say what I just said, and I am still right.

Show us your math please then, enlighten us.  

Light takes 8 minutes to move from sun to earth.  If you are moving at twice the speed of light that means it will only take 4 minutes to move between the two.  So no you will not arrive before you leave.

I use good math.  This is bad math:

True from the sun's frame of reference, I suppose.  Very cute.

Grab the relative simultaneity equation, screw around with it until you get a delta-t' that isn't zero, and pretend you have instant teleportation between the different frames of reference.  That will give you an idea of what happens to causality at FTL speeds.  You don't even have to do the Lorentz transformation yourself.  Just google "special relativity equations".  All you have to do is algebra.  You can do algebra, right?

The accuracy of whatever you caclulate is experimentally verifiable to about fifteen decimal places.  Any new theories of relativity will give you the exact same answer, no matter what we discover in the future.  Beyond those fifteen or so decimal places, maybe there's room for a better equation.  But never in the future of mathematics will a new theory give you a different answer within that degree of specificity, or else it's wrong.

If this isn't enough to convince anyone, then you may as well believe the Earth is flat.

-Dr. B

from Earths point of view too.  4 minutes is 4 minutes on earth.

...and every point of view stationary with respect to the Earth.

-Dr. B

I get what your saying but everyone knows that the eye plays tricks on you.  Besides if it looks like you lift 4 minutes later doesn't really matter since your already there.

Thank you.

Still, I'm not convinced, words like "screw around with it", "pretend", "any new theories will give you the same answer", "no matter what", "never", and my favorite one "accuracy of whatever you calculate is experimentally verifiable to about fifteen decimal places". Does that mean if I calculate the world is flat I can experimentally verify it to fifteen decimal places? Sweet

The original argument is that you are move at such speed that you go from the sun to the earth in an instant. Thus when you arrive on earth, you will arrive in time to still see the light from the sun when you were there, thus you can see yourselve in the sun while you are in earth. But definitely this involve much more than twice the speed of light.

And it will still be an illusion.

You can try.

The original argument, and in fact, all subsequent arguments have nothing to do with physical observation whatsoever.

I deserve more intelligent discussion.

-Dr. B

Lol, someone is desperate for attention, I was not talking to you there Dr. B, I was responding to danielost post about moving at twice the speed of light.

So my IMAGE would "arrive" at my destination, but I wouldn't make some kind of copy of myself, right?

No you would just LOOK like you were in two places at one time.

u kno, 100 yrs ago, ppl said that it was impossible to fly, 50 yrs later, ppl said it was impossible 2 go faster than the speed of sound, ppl used 2 say that there were no more big scientific problems left to solve, then einstein came along & made them look foolish,  today, we have mathmatical proof that mathmatics are not definite and are very fallable, mathmatecally speaking, i can run straight into a brick wall & theres a chance i could pass right through uninjured, leaving the wall intact. so unless u kno everything in the universe & essentially become god, u cant say that something is impossible

well im seeing a lot of topics in these forums about life on other planets, i srsly think you guys need to stop one second and contemplate what your saying, personally i do believe life exsists on other planets but as intelligent or advanced as us i dnt quite know, i personally think that if we ever find life on another planet it might be something such as microorganisms or if it has evolved, it only has  to a certain extent , we might find things such as wat was found on our planet a couple million years ago, animals that resemble dinasours and such because remember the only reason mammals grew out of the shadow of dinasours is that when that big rock hit us , darwins theory of naturalism kicked in and the dinasours simply werent able to adapt to the changing environment , we were. so because of this i think that another planet somewhere in the galaxy that might support life will probably have life similar to pre ice age earth since the evolution of the planets species has not been altered by some catastrophic event.

also i think in my lifetime (im 18) im gonna c man land on mars and in my sons lifetime he might c mars and maybe some other planets in our solar system be colonized. nw to leave the constraints of the solar system is going to be very hard and might not happen for thousands of years ... also for those of you that say einsteins theorys were incorrect theres this great scifi book called forever war that deals with faster than speed travel and the effect of time dilation on a person and  that persons home planet (remember what is time????? time is measured simply by the earths rotation around the sun, in deep space ur not rotating anything, ur not being held by the constraints of time in deep space time doesnt exist)

nah, im not lucky enough lol