BB FANS

Although it will never be possible travel in time. If you could journey back in time who would you like to meet?

I would like to have met James Dean to see if he was really wild and I have to admit to wanting to meet Marilyn Monroe.

But also President Kennedy
Cleopatra
To know if their was a Helen of Troy, whose face launched a thousand ships.
And loads more

I'd liek to go forwards...to see where we get!

Id go back to yesterday,and id stop myself from getting this new hair cut i got yesterday, its to short!!

Time travel backwards can not work for a number of reasons.

1. There are no visitors from the future, so Time travel will never be invented

2) According to one physicist if you could go back, you would just create an alternative universe / Thread at the point you re-entered and not effect the world you leave

3) the Chronology protection conjecture prevents you changing history

Forward time travel is of course possible, being a consequence of the general theory of relativity. This has been demonstrated in that certain sub-atomic particles have been shown to have a longer life when they were moving at relativistic speeds in an accelerator

Lol. I think you've lost me there Sticks!

And I've gone cross eyed.....


I'm actually quite worried, all of that made sense!

I'd go back to last night, leave my phone at home, avoid broken galss, and lock my best rfiend in a cupboard! But not with anyone, of course!

But by your reckoning then it isnt because if :



There are also none from the past (at least i've never met any) - which in effect would be the past of our future!!!!

AHHHHH!!! *Strokes chin in a knowing fashion*

"Forward Travel" is what we are doing now, kind of.

What I was talking about was what is known as the twin paradox.

This is where you get a set of twins, and one goes in a space ship that can travel at relativistic speeds with an atomic clock, while the other twin stays on Earth with an identical. One consequence of the Special Theory of Relativity, is that the Speed of light is a constant in what ever frame of reference you choose. The result, according to the time dilation effect , is that the moving twin's clock appears to slow down to the twin on the Earth.

The equation given for the apparent time observed by the Earth bound twin (To) is To = t.SQR(1-v^2/C^2)

Given: t = time for the travelling twin
v = relative velocity of the travelling twin
C = Velocity of light (3 x 10^8)

If this journey is maintained from the travelling twin's point of view, time passes on Earth very quickly and their twin ages and dies before their eyes. When the travelling twin returns, they will have effectively travelled on a one way trip into the future.

This phenomenom has actually been observed when they had two synchronised atomic clocks, and put one in a US Air Force plane and flown, while the other was on the ground. On return their was a measurable difference.

The other way of going forward in time is to be in a large gravity well, because this can cause the time dialation effect as well, (This was used as a plot device for the TV series Andromeda)

MODERATOR!!!

Could we please move this to the "confuse the **** out of other members" forum PLEASE!?

Thank you!!!

Sticks you either have too much time on your hands or you think too much!

uhhhhh...yeah......so....how about that Star Trek convention, it was ragin'!!!

Looking over my old posts I can not believe I had got this wrong. It was not the General Theory of Relativity, but the Special Theory of relativity.

Here is a thought experiment to show time dialation.

Imagine you have two people, one on a train and one beside the track.

The observer on the train has a light clock which consists of a light pulse that bounces off of two perfect mirrors.

To the observer on the train, the light pulse only goes straight up and straight down.

However if the train is moving, whilst the observer on the train continues to only see the light pulse going staight up and straight down, the observer by the track will see the light pulse taking a diagonal up and down path due to the motion of the train, and thus taking a longer route, because to the observer by the track, there is this additional horizontal component to the path the light pulse takes.

Now the speed of light is the same whatever frame of reference you are in, and for the observer by the track, the addition of this horizontal component caused by the motion of the train means that the light pulse, from his vantage point will take longer for it to travel between the two mirrors of the light clock, whilst to the observer on the train, moving with the clock, there is no such horizontal component, meaning from his vantage point the pulse takes a much shorter path.

The only way to square this circle and account for the discrepancy in the observed time it takes for the light pulse to travel from mirror to mirror, to either observer, is for time to slow down for the observer on the train..

This is the special theory of relativity somewhat simplified, and indeed it has been measured experimentally.

In the next post I will deal with time travel to the past

A while back the physicist Professor Stephen Hawking threw a party but he did not send out any invites prior to it.

This was an experiment.

What he did do was place in various archives after the fact, the details of where and when the party was, with an invite to all time travellers in the future to come back in time and attend his party.

however nobody showed up, even though the dates and times of the party are listed for future generations.

According to the professor, this shows the the direction of Time's arrow is only one way

Never mind all that look up there its the old me