Back to Home

UFO Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | UFO Discussion and Tracking | Post

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Just Testing HTML... No Need To Read This.

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Mark on November 13, 2001 16:57:20 UTC

The reason there is so much difficulty in having Alex acknowledge time as a dimension is because of his belief that although we can move 'forward AND backward' along spatial dimensions, we cannot accomplish "backward motion" through time (thereby disqualifying time as a candidate for being deemed, "dimension".

However, just because we cannot "time-travel" into the past... doesn't mean that we must immediately jump to the conclusion that time is not a dimension. In fact if it isn't a dimension, then what the heck is it Alex? You never did seem to come up with a satisfactory alternative answer...

The way I see it is this-
In junior-high we all learned one of the most significant theorems in all of geometry...

... a2 + b2 = c2 ... (Pythagorean Theorem)

In first year algebra/introduction to geometry (9th grade) we proceed to learn Cartesian coordinate representation of Pythagorean Theorem...

... (X2 - X1)2 + (Y2 - Y1)2 = d2 ...("Distance Formula"), where Xi & Yi are respective points' coordinates and 'd' is measure of distance evaluated in arbitrary system of units (meter, foot, furlong, etc.)

One of the first things a 14 year old child will notice is that 'Distance' can NEVER be negative! Even if we travel away from a point, stop, and reverse course traveling "BACKWARDS" along a spatial dimension... we still are never allowed to say that we traveled "negative three meters" (in the opposite direction).

So for Alex I ask...
If we can't travel -3 meters in space, then why should we have to be able to travel -3 seconds in time (in other words "backward" in time, or "into the past") in order for "time" to qualify as a "degree of freedom" (=dimension)?? Under your reasoning Alex, space can no more be represented by "dimension" then time can (distance formula does not allow for negative distance).

Even consider the Minkowski Metric...

... ds2 = c2dt2 - dx2 - dy2 - dz2 ... (extended Space-Time distance formula; evaluated in 4 dimensions)

It says that two points can have the same spatial coordinates and still be separated because of "distance in time" (4-dimensional distance between two different events). The rate of separation between two rest-frame events just so happens to be valued at c... so in other words, we move through the dimension of time with speed c when at rest! Of course the word "rest" is in this sense relative; and hence motion through time is not absolute, but rather relative.

Follow Ups:

    Login to Post
    Additional Information
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2022 John Huggins All Rights Reserved
    Forum posts are Copyright their authors as specified in the heading above the post.
    "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
    are trademarks of John Huggins