nopeda, on 15 October 2012 - 10:09 PM, said:
My connection speed is too slow to watch videos. Why don't you just tell me what they say makes the adjustment? If you would say time dilation then you would need to explain how it could adjust the light from all the countless different velocities of different light sources in the universe so they all impact the area where humans can test at the same velocity relative to them. If every light source had the same velocity relative to Earth then time would only need to make one adjustment, but since the velocities are countless it would most certainly need to make many many different types of adjustments, both in a positive and negative way accounting for velocities toward and away from us.
It's ironic that the discussion relates to the speed of light and your connection speed is insuffient for the video. I wish you could watch it. A least save the link so at somepoint you can.
Time and space distort so that light speed is always constant to the observer. It is a hard concept to understand, but time and space are not absolute. Think of them both as being elastic and they "slosh" back and forth between each other.
We think of empty space as being just that, empty. If, indeed, it were empty, then the idea of having 2 points separated by a certain distance would be impossible. If space were "empty", then 2 points in space, by definition would occupy the same location. In order for them to have separation, something must be between them which is space. Space is like a fabric or matrix. It can bend, twist, and stretch.
Space, itself, is constantly expanding and the mind boggling thing is that the expansion is accelerating. The entire universe is expanding faster today than it was 5 minutes ago, and a lot faster than 1 billion years ago.
The faster an object travels, the more space and time distort around it relative to an observer. This accounts for the differing adjustments necessary for the countless objects we can see in the universe. It's all done automatically for us.
When the ISS crews return to Earth after about 6 months in space they have aged several milliseconds less than us, and clocks they take with them have lost time also.
Estimates vary, but if you were to ride a spaceship at lightspeed away from earth for 1 year, then turn around and come back again in 1 year, you would only age 2 years. Incredibly your family, your children, your grandchildren and many generations of your decendants would have lived normal lifespans and all be dead and gone. You would have one helluva stack of newpapers to read to catch up.
If a rocket went flying past us near light speed, it would look to us like it had been dramatically shortened. If it had a clock on board that we could hear ticking, the clock would be running very slowly from our perspective.
No matter where light is reaching earth from, if we measure the speed of light from any star or galaxy no matter how far away it is or how fast it is travelling either towards us or away from us, the light is travelling about 671,000,000 miles per hour. The only thing that ever changes is it's frequency never the velocity.
It's hard to get your head around this because we live in a world where everything is constant, including time, because we move very slowly.
Hope that helps a bit.
Edited by synchronomy, 16 October 2012 - 01:12 AM.
At the heart of science is an essential balance between two seemingly contradictory attitudes--an openness to new ideas, no matter how bizarre or counterintuitive they may be, and the most ruthless skeptical scrutiny of all ideas, old and new.
This is how deep truths are winnowed from deep nonsense. -- Carl Sagan