Quote:
Originally Posted by
Asmodian
No, it really is not more accurate. Why do you insist that time cannot curve when the math clearly shows curved time? It is mostly the time portion of the tensor that is curved with orbits around Earth, the space around Earth is almost perfectly flat. Taking an understanding of Special Relativity and deriving General Relativity is not easy, it took Einstein 10 years. Special Relativity only deals with flat spacetime, no gravity and no acceleration. You cannot use Special Relativity to understand black holes.
We use the term spacetime because it is a description of a 4D space, not because the curvature of space affects time in a reliable way or anything understandable like that. There really are four dimensions in the math, time is not separate and there is no passage of time. Everything is geometric, not dynamic. It is not easy to understand but saying something else because it makes more sense would be wrong.
You insist that this oversimplification is helpful to make it easier to understand, but if you get the wrong understanding from it it does not seem very helpful.
The nature of reality GR describes is so outside our experiance that pretty much no one can actually believe it intuitively. This is why this image of a black hole is so important. All our experiments keep showing the math is perfectly accurate but what the math seems to describe makes no sense so we need images to keep convincing ourselves its predictions really are true.
You and I could clearly have a much more interesting conversation outside the scope of this thread. I do not discount any of the points you are making, but I maintain that your level of understanding is beyond that which is appropriate for a laymen.
I do maintain that it is more accurate to say that space curves and time dilates rather than spacetime curves. It's easier to explain it that way, and time is really not something than can curve. IMO, if you think of time as something that curves, you are lacking some understanding. That said, I do not want to discount your statement. It is clearly well informed and equally valid, at least. You have clearly done more than enough research to carry this topic well beyond the scope of this thread.
As long as we're at it, 'Ill ask you a different question just for the sake of having a well informed discussion about astrophysics. Hopefully the mod will not object to a subject change.
What evidence are you aware of to prove that the universe is or is not expanding? What are your critiques of this understanding?
If we are going to measure eachother understanding of astrophysics, I think this is a good place to stare that can lead to a lot of relevant conversation. Should this thread go on because of it, MOD PLEASE MOVE OUT OF NEWS.
/thread