Quote:
Originally Posted by tommac
Time slows as one approaches a black hole or any gravitational source ... a clock runs slower on the top of a mountain on earth than it does at sea level.
Also speed compresses time as you near the speed of light.
If space expands ... then time has to expand or c is no longer a constant
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The first two are true. The last one might or might not be, or the speed of light in the universe may change over time or with expansion, or something else. In any case, what Grant and Richard said still stands. Time is relative. I would say that time is just a measure of a comparison of motion to begin with, so with a black hole or relative speed, one can stand "outside the box" and say that time is passing differently for another. We measure time with our own clocks. But if all of the universe slowed or sped up at the same rate than there is no outside by which to compare motions in order to say that one is moving or aging faster or slower than another. The clocks still tick at the same rate that observers within the universe view them and age. It is similar to the reason that we dismissed the idea of an ether, since we couldn't observe it directly, although it couldn't be proven or disproven, but within the domain of Einstein's relativity, it wasn't necessary.
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Let's put together the pieces of
The Grand Puzzle . (website)
"Let's define another operator, Sz, which we won't pay any attention to."
"This transformation will automatically make zero equal zero."
"It may be true that zero equals zero -- and that is certainly an equality -- but I don't want to go into the details at this time."