Jun 05, 2011 at 12:01AM EDT0
Feel free to spam my wall (well, not really, but you know what I mean, I hope) with multiple posts or send me a message if you need to be more verbose.
Anyway, I still can’t tell whether you’re asking a scientific question or philosophical one. I have no idea what you mean by saying time is a man-made thing. Time exists with or without mankind to measure it. The reason time is (almost) always a factor in science is that time is an intractable part of anything. I mean, you take something as simple as “How much does object X weigh?” and scientifically, weight is an expression of force, which is usually expressed in something like pounds per second squared if I remember correctly. (It’s been a long time since high school physics, or any science for that matter; last science class I was officially enrolled in was an astrophysics class in late 1994.) You ask “What color is object X?” and you have to deal with wavelengths of light, which are an expression of photon energy phasing at a specific rate of time.
Now, as for time travel, there are various theories about how possible paradoxes would be resolved. One of them was actually explored in the recent movie “Source Code”, which I’ll try not to spoil in case you’ve not seen it, but the idea is that decisions and events create different possible universes, which would suggest time being more than a single dimension. That’s not my favorite, though. More reading here: http://en.wikipedia.org/wiki/Temporal_paradox
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