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Message: <blockquote data-quote="BigDaddy1" data-source="post: 2645603" data-attributes="member: 228422">First of all, it's not a necessary conclusion.  If you're using physics (special relativity in this case) that *depends* on the vacuum speed of light to be a true barrier, then using those same physics to draw a conclusion from an impossibility is not necessarily valid.The main argument for this relies on using special relativity to show that if you have faster-than-light transport in some inertial frame, then it is possible to find a different inertial frame where that same transport is backward in time.  If you've never worked with Minkowski diagrams, then this link might not mean much to you, but for those familiar with them you can see how the presence of a single faster-than-light transport path allows for time loops to appear.http://www.theculture.org/rich/sharpblue/archives/000089.html</blockquote>