Time Travel: Einstein's big idea (Theory of Relativity)

To watch the whole documentary in High Quality go to:
http://www.youtube.com/watch?v=imaq16YuEnE

Here is a little clip about how time travel can occur. The clip was taken from: The World's First Time Machine (Discovery Channel). Dr Ronald Mallett

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• Time
• travel
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• big
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• theory
• of
• relativity
• light
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• First
• Machine
• Ronald
• Mallett
• Discover

[chumsyalibumsy09]

Like if youre watching in 2099!!

[goofdangas69]

so even if i buy a delorian im still gonna have to go faster than 88 mph to go into the future this is bullshit

[johnnyckrock]

@Biarry no, nor should he have, since it did not move relative to him. But when the light reflected off one mirror, why, as it moved through space on it's way to the other mirror, did it keep up with the mirrors and the professor? That's the part that the example doesn't explain.

[Biarry]

@johnnyckrock Did the professor see the upper mirror move 200 km from 2:51 to 2:52? The distance his tiny cosmically irrelevant Solar system covered in one second orbiting around the galactic center?

[johnnyckrock]

...and while that may be true - that the observer who moves with the clock will not see the clock slow down - it doesn't seem to me to be explained logically by the analogy. Relativity requires that when this observer sees the light hit the second mirror, it will appear to have come from where the first mirror is NOW (relative to him), instead of where the first mirror was a short time ago.

[johnnyckrock]

Well what I meant by "stationary observer" was one relative to whom the clock is moving. My point was that they would see the mirrors moving, and the light therefore having a longer distance to travel between mirrors. But I don't see why an observer who is with the clock would see anything differently. He should still observe that the second mirror has moved on since the light reflected off the first one. But I am told he will not see this relative movement between light and mirror.

[Biarry]

@johnnyckrock Now you only have to solve one tiny remaining problem - what is a stationary observer?

Is the professor the stationary observer when he starts the clock at 2:45? Does he see the "true" ticking speed of the lightclock (1 second for a full cycle), or is it slowed down?

[MarinRayado]

Back to the future!

[johnnyckrock]

This makes no sense. The light clock slows down because of the relative movement between the photon and the mirror. This has nothing to do with the relative motion between the complete clock and a stationary observer. You are simply increasing the distance between the 2 mirrors. No time dilation or special relativity is required to explain that - it is trivial: the clock would appear to slow down to ALL observers!

[D5932]

to me time travel is impossible. well einstein said it was impossible too, since u cant go faster than light. Unless "you" , your body only , without the spaceship travels faster than light, u will not stay young, you will still have interactions with the ship, so you will age. Can your body stay intact while going faster than the speed of light? unlikely. Humanity can only dream about this. We won't see time travel happen. But I like surprises.

[D5932]

@Spulpacz according to u, how far past can we go after we invent the machine. till the time we invent the machine?

[saqib461]

F i wish this was real i mean like real time travel