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All modern science is based on theory, and any new theory which matches observations better than an old theory can replace the old theory. But as long as there are many observations consistent with the theory and no observations to contradict the theory, isn't this a fairly sound reason to have some confidence in a theory?
originally posted by: Boadicea
Everything you are referring to is (first and foremost) greatly theoretical in nature, and involves how we observe or measure or experience "time," so it is related to time, but is not time in and of itself.
Yes, the theory has been validated in several experiments. The first notable experiment was the Hafele–Keating experiment which put atomic clocks on airplanes and flew them around the world in opposite directions, and more modern experiments have increased the accuracy further. Experimental results have been consistent with theory so the theory is tested, not untested.
originally posted by: midicon
I think (if memory serves) that this theory was proven by the measurement of the passage of time on quartz clocks on satellites.
Correct, Time dilation is not about accuracy.
originally posted by: moebius
a reply to: Boadicea
Um... I'm not sure what you mean.
You stated:
Time dilation is about the tools (clocks) that we use to measure time and their accuracy, as affected by different factors.
That is wrong. Time dilation is not about accuracy of the tools (clocks) that we use to measure time.
You have merely demonstrated that you don't understand the concepts in modern science relating to time, nor do you fully understand what "accuracy" means.
originally posted by: Boadicea
Clocks are created/built to denote specific increments of time according to a specific value. It they are not correctly denoting those specific increments of time according to that specific value, then they are not accurate.
Obviously, outside factors can affect the proper function of the watch. When that happens, and the watch does NOT denote the proper increments of time according to the proper value, then the time reflected is inaccurate.
Unfortunately, as spaceship velocities approach the speed of light, interstellar hydrogen H, although only present at a density of approximately 1.8 atoms/cm3, turns into intense radiation that would quickly kill passengers and destroy electronic instrumentation.