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 Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...The Space and Astronomy Agora Re: Re: Re: Re: Wait A Minute. Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response ToPosted by Michael Wright on January 18, 2001 04:10:37 UTC

How is time not a dimension?

In a two-dimensional cartesian coordinate system, two points (x,y) are needed to precisely identify the location of the point. In a 3-dimensional world, three coordinates (x,y,z) are needed. In our four (extended) dimensions, four coordinates are needed (x,y,z,t).
For instance, let's say I'll meet you at the corner of 3rd and 6th streets (x & y coordinates), on the second floor (z coordinate), and at 3 pm (t coordinate).
By saying time travel is a logical contradiction I assume you are saying that we can't travel through time. If that's not what you meant, disregard the next argument :). Well, we are always travelling through time (albeit only forward, not backward), don't we? I once read an argument that everything is travelling at the speed of light through space-time. The thing is, is that we are spending most of our motion through the time dimension and only a small portion of our motion through the three extended spatial dimensions. Whaddya think?