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Why In Heavens Name Faster Then The Speed Of Light
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<blockquote data-quote="Harte" data-source="post: 18073" data-attributes="member: 443"><p><strong>Re: Why In Heavens Name Faster Then The Speed Of Light</strong></p><p></p><p><div class='quotetop'>QUOTE(\"preethi1986\")</div></p><p>Preethi hit on the gist of the question. Which reference frame to use. This is the answer to the (forward) time travel involved at relativistic speeds, aka time dilation. It turns out that any light measured under any circumstances always travels at the same speed relative to any observer. That's what Einstein meant when he said the speed of light is constant.</p><p></p><p>If you are in a ship moving at high speed and you shine a light along the direction of movement, no matter how you measure it your measurement will show that the light is moving away from your source at the speed of light ?.</p><p>If you are outside the ship and at rest with respect to the ship and you somehow measure the speed of that guy's flashlight beam, no matter how you measure it your measurements will also show the beam to be moving at the speed of light?. How to reconcile these two facts?</p><p> </p><p>Speed is measured in units of distance divided by time (d/t).</p><p> </p><p>If you are the guy outside the ship, you expect the beam to be traveling at c+s (s=ship speed) but you find that it is travelling at c, which is much less than c+s.</p><p> </p><p>Since the speed (d/t) is less than it should be, the only way to account for this is that either d has decreased (constriction of length) or t has increased(dilation of time). In fact, it has been proven experimentally that both of these outlandish things happen at any speed. It's just that they aren't very noticeable until you get to speeds which are at least a fair percentage of c.</p><p>If you are the voyeur looking in on the astronaut's light experiment, if you look at his clock you will see (part of) the reason his measurement of his light beam is the same as yours. His clock will appear to be running very slowly to you, which is why you see his light beam going slower than you expected(traveling at speed c instead of speed c+s as you would expect.)</p><p> </p><p>Exact amounts of length constriction and time dilation for any given speeds can be easily calculated from Einstein's field equations. Google that for more info.</p><p> </p><p>This explains time travel into the future. Travel into the past requires a very powerful rotating gravitational field.</p></blockquote><p></p>
[QUOTE="Harte, post: 18073, member: 443"] [b]Re: Why In Heavens Name Faster Then The Speed Of Light[/b] <div class='quotetop'>QUOTE(\"preethi1986\")</div> Preethi hit on the gist of the question. Which reference frame to use. This is the answer to the (forward) time travel involved at relativistic speeds, aka time dilation. It turns out that any light measured under any circumstances always travels at the same speed relative to any observer. That's what Einstein meant when he said the speed of light is constant. If you are in a ship moving at high speed and you shine a light along the direction of movement, no matter how you measure it your measurement will show that the light is moving away from your source at the speed of light ?. If you are outside the ship and at rest with respect to the ship and you somehow measure the speed of that guy's flashlight beam, no matter how you measure it your measurements will also show the beam to be moving at the speed of light?. How to reconcile these two facts? Speed is measured in units of distance divided by time (d/t). If you are the guy outside the ship, you expect the beam to be traveling at c+s (s=ship speed) but you find that it is travelling at c, which is much less than c+s. Since the speed (d/t) is less than it should be, the only way to account for this is that either d has decreased (constriction of length) or t has increased(dilation of time). In fact, it has been proven experimentally that both of these outlandish things happen at any speed. It's just that they aren't very noticeable until you get to speeds which are at least a fair percentage of c. If you are the voyeur looking in on the astronaut's light experiment, if you look at his clock you will see (part of) the reason his measurement of his light beam is the same as yours. His clock will appear to be running very slowly to you, which is why you see his light beam going slower than you expected(traveling at speed c instead of speed c+s as you would expect.) Exact amounts of length constriction and time dilation for any given speeds can be easily calculated from Einstein's field equations. Google that for more info. This explains time travel into the future. Travel into the past requires a very powerful rotating gravitational field. [/QUOTE]
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