# Thread: Time travel is science-fiction

1. The theory of relativity states that as the velocity of an object nears the speed of light, time slows down.
If person A travels for a few hours at half the speed of light and returns to Earth, that person A has aged much slower than person B who stayed on Earth. This difference in aging is because time passed much slower for person A than person B, because person A was traveling closer to the speed of light. While just a few hours passed for person A, person B experienced many years.
Let's say we have a wormhole which mouth is portable. It is then carried on a spacecraft traveling at 50 percent of light speed. The other end of the wormhole is on Earth.
When the spacecraft returned to Earth a few hours (according to the spacecrafts clock)later a few years would have passed on Earth.

Okay, so far so good.

But do we now have a time machine? No, we do not. Time has only passed slower for the other end of the wormhole.
The effect of going through the wormhole would be the same as if you stepped through a space shuttle's porthole after it returned from a mission. Time in the shuttle would have only passed slower, it does not become a time machine into the past. You can't go back when there is nothing to go back to. Except maybe if you consider the shuttle is the past, because it has aged slower.

Ps. I'd be happy if anyone could show me if I'm wrong. Many of the world renown scientist seem to me as a bunch of idiots when it comes to time travel and I sure would be happy if it was just me who is the idiot.

2.

3. Wormholes, can anybody tell me if this is a theory to fit an observation - (ie an oddity seen through a telescope), a hypothesis to fit some fact or event (ie to explain the presence of a dead alien) or just pure conjecture?

If worm holes then why not also the mobius universe?

At least that way the wormhole is everywhere you just have to 'punch' into it.Hollywood could design the machine and then it could all be written down into science as fact. I can see the technical specification now,
"Operates using two incredibly powerful counter-rotating uni-polar magnetic fields which wrench a tear in the very fabric of space-time"

You can excuse me for not getting two excited about these things, at close to 70 it's just a little to hard to get these false teeth into :wink:

4. Stepping through a theoretical worm hole would not be the same as the time passing "slower" on the shuttle. With a worm hole the change in time is instantaneous. Also if you were to somehow create a wormhole from one time to another, there is no reason you wouldnt be able to step back into the wormhole and return to the time you left, You are unable to do that through space shuttle travel.

5. For time travel to be possible every passing state of the universe would have to be preserved somewhere like pictures on a film strip. I don't see any reason why the universe would work like that.

Even though in the other end of the wormhole time goes slower it's just there where time is slowed. How would going through it turn back time in the rest of the universe?

Just thought of another problem. A wormhole is just a curvature of space and space does not have mass, it's just space.

6. Time travel isn't possible? Well dang...and I was just about to hook up the "Mr. Fusion" to the flux capacitor in the old Delorean. I can't believe Hollywood lied to me. Guess I'll have to find a different way back to 1986 to ask Jennifer Berry to the prom. :wink:

7. Originally Posted by MacGyver1968
Time travel isn't possible? Well dang...and I was just about to hook up the "Mr. Fusion" to the flux capacitor in the old Delorean. I can't believe Hollywood lied to me. Guess I'll have to find a different way back to 1986 to ask Jennifer Berry to the prom. :wink:
Time travel is possible we are all doing it - all in the same direction at near enough the same rate.

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