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iksun1002 iksun1002
wrote...
Posts: 59
Rep: 7 0
11 years ago
Suppose someone is hypothetically traveling at close to the speed of light, departing from earth and bound directly towards the sun.

To an observer on earth, solar light takes roughly 8 light minutes to travel from the sun to the earth.

In this case, however, the traveler is heading in the opposite direction of the solar light, so to the observer from earth at velocity 0, it would appear this traveler is moving past the solar light at the speed of light + his velocity, and it would take less than 8 light minutes for this traveler to see the solar rays.

But the traveler has a watch on his wrist that measures time; and in order for the light to be passing him at only the speed of light and not any faster, his watch would have to still show that exactly 8 light minutes pass before the solar light reaches him.  Hence his watch would have to be ticking faster, not slower, than a clock on earth, right?


But suppose another object of light is moving from earth to the sun, same direction of the traveler.

How is it now possible for this traveler to be passed by Both these objects at the speed of light while with respect to one direction, the traveler's clock would have a slowing down affect, but with respect to the light going from earth to the sun to see THAT at speed of light, the traveler's watch would have to be ticking at faster than earth's clock?

What am I not getting here?  Is this traveler watching time elapse in different increments unique to many different objects?
The only way I can rationalize this would be that if the traveler made a 180-degree turn and headed back to earth at any velocity, the time would then appear slower to the traveler as measured by earth than on the sun to bring the timeframes of the two objects earth and sun back into equilibrium with the earth viewer once the traveler made it back home to earth
Because if time just slows for the traveler, then from the traveler's vantage point, you would sense moving faster than light when traveling "towards' a beam of light
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wrote...
11 years ago
All SciFi stuff.
You don't have to be headed on a kamikaze path to the Sun either. AstroPhysics includes observations about energy accelerating out of our universe. And, acceleration until our mass turns into Energy (the 'E" part of E=mc²) would give results we will never be able to verify from testimony.
wrote...
11 years ago
Who says that the clock has to show 8 minutes while travelling towards the sun.
Light takes 8 min to reach the earth.
If the person is moving towards the sun then obviously the distance between the person and the sun will reduce . So to cover this reduced distance light will take less time.
Suppose that light from sun and the observer depart at the same time, at same speed towards each other. So they will meet midway and time recorded will be half. Also considering the relative speed of light as twice its normal speed time recorded will be half

As for the source of light from earth, IF person is at the speed of light then he will always maintain at a constant distance from it (maybe even 0) and they both will never surpass each other. So no question of time measurement.



Its true that time would slow down for the traveler. This is because of the frame of reference.
For a person on the earth ,since his frame of reference is stationary light travels at normal speed. But for the traveler since he is moving at light speed, so is his frame of reference. So for him, he is travelling at nearly twice the speed of light(relative to the light beam).
This is not his actual speed but only his relative speed.
For example say a person is moving in a train with its windows shut at a constant speed. He would feel that the train is stationary just because his speed with respect to the train is zero
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