To obtain a good vision of animation use a Pentium or similar system at least

Quickly, a brief travel along time

• Set a future date at "live at".
  I counsel only a few hours or minutes after your current system time
• Let it be "in" 1 minute duration time to go at desired future date
• Press "accelerate"
  All is automatic. Decelaration also.
  Program itself computes and accelerates until required velocity and shows it value in the "INFORMATION" box.
  After, program wait for the "in" setting time (default 1 minutes) in the hyperspace. After, program decelerate until velocity zero.
  At end you could observe the DIFFERENT time at two display. If you press a manual "decelerate" program ends voyage and don't go to preset future time. But you are lost in the hyperspace at a no desired time! So you have to save yourself pressing SYNC!.
  Warning! The landing time could be not perfect. The problem is normal because to decide (for the program) to start deceleration a microsecond before or after, correspond to minutes, hours or days on Earth.

Introduction
The time machine is, unfortunately. today a invention in the list of the unpractical things.
Notwithstanding its difficulty to exist, it has been a lot used for scientific fiction literary and cinema purposes. Often without a theoretical scientific basis.

A question:
A time machine realization could be a real scientific basis?

Yes! If you take a look to the last (and penultimate) discoveries and postulations of the Theoretical Physics, it seems is more correct to demonstrate the NOT validity of a theory than its possible validity. The fact is that we need to retain all is possible, except to demonstrate the contrary. Naturally this is a big exaggeration, but if you read some article or book about Quantum Phisycs or Relativity Theory, you note that facts as:

• "Observers that have synchronized their atomic clocks and placed at different altitudes, observe different times".
  And, you have to think, atomic clocks placed at equal altitudes have, for centuries, equal times. This is the better test of the Relativity Theory exactness.
• Or, "a mass crossing a plane obstacle in which we have made two parallel holes, at the end of the experiment, it is not sure the trajectory mass and the crossing hole, on the contrary, after results parsing, we conclude that the crossing holes are both at same time!" (interferences of the light and molecular rays)

Read something about the gravity wave.
I counsel a Stephen Hawking's book, a very famous physics' "mind" today:
"A brief history of time". This book simply explain (is sufficient the physics school and there are not formulas) the new theories of the macroscopic and microscopic universe until the GTU theory that is to say "Everything Theory" or the "Superstring Theory". Today, for the average researcher is not easy to formulate theories because it's difficult demonstrate their validity. Hawking himself affirms that only the researchers that are part of scientists equipe could verify the results of his experiments, because the modern experiments are possible in the laboratories containing expensive apparatus only. Nearly it is true for famaous scientists also because the theories are made without difficulty, instead the verify of this theories have a very high costs. And such costs are very high for government corporation also.

But to simulate it is a wonder game always.
For this I have made this applet written with Java. It simulates a time-travel in the future and shows the consequences about space and mass of the voyeger.

Crossing the time
Hawking retain a time-travel , theoretically possible notwithstanding, is impossible surely for a definite reason: if time travels are possible for the future men then we could have visits from them!
But I don't think this. The reasons could be two:

• pessimistic hypothesis
  If time travels are theoretically possible, it is not sure that future man progress will be able to allow a time travel before the end of humanity.
• Philosophic hypothesis
  If time is a dinamic dimension like space then man, notwithstanding he remembers his past like unique, he could have his history varying continually!? And between all the possible histories don't exist one containing a time travel.
  In fact, a time travel could interfere with past or future events and then to self-destroy the iper-man (a man with his history) himself.
  Therefore the unique possible histories will be the histories no containing such travel.
  (Read to purpose "The dinamic time").
  If man is a living being into space, he is such along the time also. Going along the time and to find again himself in the past is equivalent to (in the space) to connect, like surgery, a ear with a foot: there are obvious consequences about the blood flow, and similarly, along the time, there are obvious consequences to the self-protracting of his time-being. For example, for humanity, to know its end date could be destructive...Then the future man could retain inopportune to travel along the time notwithstanding the technology would allow it. Perhaps it will be possible some days or some hours backtracks only to adjust "wrong events".

I understand I haven't made a good explain, but I repeat: you have to read "The dinamic time").

Applet tools
This applet simulates a relativistic voyage and the observation of the consequential results.
In the applet window are shown two big displays. The cyan one shows the time on the spaceship and the yellow display shows the time on Earth.
Therefore, to be simple, the time on spaceship will be equal to current time, equal to time on your watch or equal to time of the computer system you are using now.
The yellow display is equiped with another little yellow display showing the day date on Earth advancing (when your speed is near light speed) very quickly. Hours and minutes will pass sudden, instead the display on the spaceship advances its time some seconds only.

Another display shows the Km x 1000 covered while another display shows a standard 70 Kg mass to enlarge when speed is increased.
Fisrt graphic window shows the space contraction.
The spaceship motion verse is at 0°. The -90° e 90°, that were the right and the left sides, have a increasing tendency to 0° at the motion verse.
The space contraction is one of the easy and better result of the Relativity Theory to obtain because, at low speed also, the space contraction obtained is sufficiently observable.
For example, the sky visible at 30° will be visible at 10°12’ running at 0.8c (c = light speed), instead, and this is incredible, that is visible at 120° (practically behind) is visible at 60°.(forward).
Last affirmation is true because now you aren't in the space, now you are in the hyperspace.
More high is speed and more the previous space become a little point in front of us replacing it the hyperspace.
This type view is shown in the second window:
This window shows you are running along a imaginary road with green piles at sideways. This road is very long (Earth-Sun radius), while another series of cyan piles surround the orbit of the EartH revolution plane.
The important fact is not the motion view, that is not implement because the distance between piles is supposed to be million of kilometers, but it is the light originating from piles that fills the entire space view.
When the speed is near 0.3c you could note the folding of piles versus the motion verse and some piles that observer on Earth without motion see in a backward position respect us, to be in a forward position, like they are far yet.

Crossing hyperspace is the same to fly
A ancient man lived some centuries ago retained Earth like a infinite platform. The main part of his world was retained two-dimensional. Rarely, for the mountains and hills, the third dmension influenced his such world's conception. Similarly we, today, consider the space a "three.dimensional platform" where the fourth dimension is for the main part constant (the time flowing constant) and no influential.
When man, at first time into space travel, noted his world become little if the distance from it is sufficiently long (perspective view), he understood that the altitude or the third dimension could influence very much his previous world's vision. So, running at relativistic speed, the universe surrounding us, become little until a point, and the new vision of universe become different of the usual conception

Scientific based software
This program is scientific based on relativistic formulas and every display or graphic window shows its result like the natural result of these formulas application. The exception is only the acceleration that is not retained a cause of a no inertial system, but only a series of continuous selections of "constant velocities". This is a forced problem because if you want really simulate the real acceleration allowed to a human being you have to remain at computer for a long time! (centuries).

If v si the relativistic velocity and c is the light speed, formulas are:

• velocity sum of V and v is: (V + v) / (1 + V*v/(c*c))
• time delay: t1 = t0 / sqrt(1 - v*v/(c*c))
• mass extension: m1 = m0 / sqrt(1 - v*v/(c*c))
• space contraction:
  if the angle between the motion verse and a ray light is an0 then: an1 = (v + cos(an0))/(1 + v*cos(an0))