How much time does he measure light to travel those 299,792,458 sticks?
“Made in China” - try to keep up.
Try to keep up - only 1/2 lightsecond.
You say the traveler measures light to travel 299,792,458 Meter sticks in .5 seconds???
To him - they are only 1/2 meter sticks that are labelled “1 meter”.
So to him, it takes light .5 seconds to travel 299,792,458 1/2 meter sticks.
So you’re saying the actual distance light travels is 149,896,229 Meters, and it takes light .5 seconds to travel that distance, so light is traveling at the rate of c, the speed of light, 299,792,458 m/s.
It took the traveler 2 seconds to travel those sticks, according to his watch, so his velocity is .25c.
He traveled 149,896,229 Meters in 2 seconds, which is .25c.
So he traveled 2 seconds, waited 10 seconds, and traveled 2 seconds back, total time of 14 seconds.
His twin at home agrees with him that it took him 14 seconds to return.
…that’s observed, not actual distance …first-person perspective, so of course one person’s line of sight will be a different perspective to another’s, and so creating two different fields of vision - Is perspective a factor in the equation? it’s not.
I have yet to read Pood’s Scientific American analysis link on the paradox, to get a fuller picture of the whole argument, and the distance/velocity theory.
Notice I said the twins AGREE that it was 14 seconds.
That’s not what Relativity claims, Relativity claims they DON’T agree on 14 seconds. But there is no way out for them! LOL
They are TRAPPED!!! LOL
They already factored their BS length contraction, and the time was according to their watch. The speed of light is c. Done deal! There’s nothing left.
They MUST agree that light travels those 299,792,458 meter sticks at the speed of light, by definition.
They don’t. To them the meter stick is perfectly normal, as is the tick rate of the clock — both are exactly the same as on earth.
If the traveler were to look back at the earth with a telescope, though, he would see clocks on earth ticking more slowly and meter sticks shortened,.
Right.
As the linked Scientific American article explains, a star six light years distant from the earth is 4.8 lights years distant for someone traveling toward the star at 0.6 c. So for the traveler the journey takes eight years by his clock because the distance is shorter, whereas the earth observer sees it as taking ten years by his clock. Time dilation and length contraction are both real.
According to the theory - if you take a 1 meter stick and somehow accelerate it up to extreme speeds and get it to pass back by you - that same stick - as it passes - will measure shorter than 1 meter.
Things that are passing by very very fast - will actually measure as shorter than they would if they stopped moving relative to you. That is the theory.
It isn’t about perspective nor about the Doppler effect mentioned in that article.
What several people here seem to be missing is the very fundamental concern of Special relativity.
Special relativity postulates that there is no “actual/absolute/objective” measure of space or time - “all is relative”. That means that things are only big compared to something small - something is bent only compared to something straight - something is fast only compared to something slow. And that idea came from Galileo - long before Einstein.
When someone discovered that light has an upper limit to its speed and nothing could be any faster - things got confusing - Newtonian physics suddenly seemed insufficient (and they were right about that). After some thought it was revealed (Einstein got the credit) that the effort to measure things is complicated by how fast the observer is moving - and no matter how fast the observer is moving - light will always be measured as moving at the same speed away from the observer = “c”.
So if one observer leaves another at high speed and lights his torch - both observers will measure the light leaving the torch at the same speed from themselves. The speeds do not linearly add - the light doesn’t leave the torch at the 2nd observer’s speed plus the speed of light - light always leaves at c and measures as such to both observers. And that means that even though the observers are moving with respect to each other - they both still see the light leaving the torch at c - mystifying but necessarily true.
Further complication that stems from that is that any and all measures of time and distance are dependent on how fast the observed/measured object is traveling with respect to the observer. The observed object will be both smaller and internally slower (slower time) - the faster it travels with respect to the observer.
The end result of all of that is “There is no absolute frame of reference” - so there is no “actual speed, actual length, actual duration” - there is only “speed, length, duration relative to something in the same frame” - nothing else exists.
Personally I am not totally sold on the truth of that - yet - but it is the current theory (James’ reports excluded).
The entire theory is just a bunch of rubbish that results from a false 2nd postulate. I’ve proved it over and over again.
Until somebody finds an error in my MD’s Box you are simply repeating rubbish! You are spreading BS!
Closing your eyes to the facts doesn’t make it go away.
With your reasoning you could probably prove that the Earth is flat and no one can walk on the Moon.
[list]“Obviously the Earth is flat else people would fall off!!”
SEE – PROVED IT!!![/list:u]
To Who? I haven’t seen ANYone say that you proved it to them.
Simpler than that.
Put a metre stick in space. Fly past in the direction of the length of the stick and it will be shorter.
Is the direction important? Yes. If you placed it perpendicular to the direction of flight, then it would be 1 metre long. (But it will be thinner.)
Distances are only shorter in the direction of travel.
Why does this happen? Because space and time are intimately connected.
Correct. I’m just trying to clarify for MagsJ that a traveler on a spaceship at relativistic speed won’t see HIS OWN clock ticking slow, or HIS OWN meter stick shortened. In constant uniform motion, he may judge himself at rest with respect to the earth observer, and if he were to look back with a telescope at earth, he’d see clocks ticking slow and meter sticks shortened on earth.
Yes.
If I think of time as how quickly things around me are changing compared to me - the faster they change compared to me - the slower I age compared to them - my time scale becomes slower. If I speed through those changes around me - they change even faster compared to me - making my aging slower still - compared to them.
And also if I speed toward the changes - those changes seem not only faster but more compressed - shorter in length - in the direction I am traveling.
But what about behind me? Why would the changes that I am traveling away from seem to change any faster or seem more compressed. It seems reasonable that what is behind me would be the opposite - slower changes and more drawn out - the Doppler effect of a siren passing by.
So does SR say that only things in front of the motion are shorter and faster?
Yes - SR only applies to observing things that are in motion relative to the observer - although the traveler still ages less due to his travel - something still seems incomplete about that thought.
That’s true in Relativity, because Einstein says length contraction occurs in the direction of travel, but not perpendicular to the direction of travel.
That is his FUDGE FACTOR to claim that length contraction occurs, which is why it only occurs along the direction of travel. It’s total BS to make his numbers add up.
Look at my box, there is NO LENGTH CONTRACTION, and the numbers add up PERFECTLY. You see how the box is traveling along the x axis, and it takes light so much more time to reach the x receiver than it does for it to reach the z receiver?
In order for the numbers in Relativity to work, he had to create some fudge to solve that issue, so he FABRICATED the concept of length contraction, to make the numbers work. But he COULDN’T do it in two directions, it would NEVER WORK!
LENGTH CONTRACTION IS TOTALLY FABRICATED BS!!
Anyone with any sense knows it’s impossible for a stick to be both a meter long and shorter than a meter at the same time! It’s total BS!
Look how obvious it is that any man would fall off of the Moon! Walking on the Moon is total BS!! 
OH LOOK, the Moon is length contracted in the x direction but not the z direction. LOL
We see the Moon as round on a full moon night, but in actuality it’s really a rectangle if you go there. It’s only round because it’s length contracted in one direction and not the other!! (/sarcasm) Laughin my f’n ass off!!!
Don’t do that mate - you won’t be able to eat.