If all positions in the universe are relative, how could you be the one moving away at the speed of light?

It can kind of be confusing, huh? The simple answer is that there's a thing call "Frame of Reference."

Two objects in the same frame of reference are moving the same speed (give or take a few miles per hour).

If you rush away from the earth in a space ship, you won't notice any time dilation in your frame of reference. If you took a telescope and looked at the earth, however, you would see Earth's time slow down.

For the earthlings looking at your ship, they would see your time slow down.

So for all intensive purposes, they're /both/ moving away at the light-speed relative to one another. Always work from some frame of reference to figure these things out, and realize that when you change reference frames, your answers will change too.

Here are some Flash animations that might help explain it: http://www.upscale.utoronto.ca/GeneralInterest/Harrison/Flash/#relativity

You can't send a rocket ship anywhere at the speed of light.

But for a rocket ship traveling at nearly the speed of light, you are correct. It is just as valid to imagine the rocket at rest and the Earth traveling at nearly c as it is the other way around. Indeed, the rocket pilot observes Earth's clock as running slowly, just as Earth observes the rocket's clock running slowly.

The difference occurs exclusively when the rocket pilot turns around. In doing so, he changes reference frames to one in which the Earth's clock reads way ahead of where it was before he U-turned.

If it bothers you that both clocks seem to go slower, then you are on your way to understanding this issue.

The best analogy I've heard is the idea of two drivers going in opposite directions on the highway and watching each other in their rear view mirrors -- both of them seem to get smaller as they separate.  It wouldn't matter who was really moving or not -- they'd shrink as they separated in any case.

Your question shows that you are beginning to understand how it works. If you travel past the earth in a star ship at near light speed, you will see that earth's clocks are running slow and they will see that your clocks are running slow. You both will see your own clocks as running normally, and you will both be right. This really does create a situation in which you cannot tell whether it is you that is moving or the earth that is moving. In fact, you are both moving relative to each other, and that is really all that can be defined. But these statements are entirely based on what is known as inertial reference frames, i.e. neither you nor the earth are experiencing any acceleration with respect to your relative motion. If and when you accelerate or decelerate in order to depart from or return to the earth's reference frame, then you clearly define which is the inertial frame (the earth) and which frame is moving with respect to that frame (you). That is where the nice symmetry that is described above becomes unbalanced and is no longer so simple. While you are traveling at high speed, the above description is accurate. But when you change speed, your clocks will not return to the way they were when you departed. That is when results like the Twin Paradox occur, where the traveling twin returns to find the earth has experienced more time than he has.

Yeah.  Once you're moving at the speed of light, it's hard to say which one is moving.  But if you start out at the Earth, and then go, relative to the Earth, near the speed of light, the Earth is in the inertial frame, and you had to accelerate.  Then you had to accelerate again to get back to the Earth.  It's the frame that had to accelerate that has it's time slowed.  And yet, it's not supposed to be about acceleration - but speed.

There isn't supposed to be a preferred inertial frame of reference.  But the twins paradox sure makes your head hurt.

As per Galilean principle of Relativity it would possible to determine which  of two  or three objects   is considered moving slower or not  at the speed of light, by only and   ONLY if there would exist an absolute frame of reference.

Since Einstein Relativity theory indicates that no such absolute frame exists; then it is impossible to tell  relative motion of two objects and, which object is at rest and which one is moving at the Speed of light.

Time dilation is integral of motional Time to a final destination. Time indicates the past and Just like Entropy it always increase,
The Present is Timeless and the Future is imaginary.

Very intuitive question.