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Shortest distance between 2 points.

Published:

Last Edited: August 29, 2013, 6:56 am

They say that the shortest distance between 2 points is a straight line.

It seems to me that if the Universe was 2 dimentional then that would be right, but as the Universe is either 3 or 4 dimensional, I don't see as how that can be right.

After all, don't they say that "space time" is curved? Is it curved or not?

It seems to me that if space time is curved then the shortest distance between any two points in the Universe is a curve, maybe to a person the shortest distance is or appears to be a (straight) line.

Time-space is not just what they call "outer space", time space is everywhere including here on Earth, so any two points here on Earth should also be 2 points in space-time, right?

So is the shortest distance a line or a curve? Is time-space curved or not? And is time-space also here on Earth or not?

Would the right answer be both: A line and a curve? I don't see as to how it could be: Sometimes a line and sometimes a curve, I would think that it would always be one or the other, but not both, after all the real universe in which we all are is either 3 or 4 dimentional, but not 2 dimensional, Isn't that right?

Does anybody here knows astrophysics?

Doesn't light travels in a curve or as a curve?

If a spaceship starts at point A and goes straight would it not sooner or later get again to point A where it came from? And if it does would that be because space-time is curved? And if so, would that not prove that the shortest distance between 2 points is a curve?

Any opinions on this?

Entry #19

Comments

1.
JAP69Comment by JAP69 - August 29, 2013, 1:11 am
The shortest distance between two fixed objects on a flat surface is a straight line.
The shortest distance between two moving objects or on a surface not flat is a different story (calculations needed).

Just my opinion.
2.
MonElComment by MonEl - August 29, 2013, 6:55 am
Yes, but are atoms flat? Are molecules flat? Is space time flat? Is there any such thing as being "flat" in a 3 or 4 dimentional Universe? Is the Universe "flat"? Does a microscope shows matter to be "flat"? Is there anything in the Universe 2 dimentional?
3.
JAP69Comment by JAP69 - August 29, 2013, 10:50 am
Yep,
I done some searches this morning on the subject and find it to be a very complex problem.
Think I will pass on this one.
4.
MonElComment by MonEl - August 29, 2013, 11:30 pm
Yes, it is a very complex subject.

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