**Re: faster than light?**
<div class='quotetop'>QUOTE(\"thenumbersix\")</div>

This is just a means of visualisation though, it does not necessarily stand up in the real world.

The point of reference use is simply to illustrate a calculation. Everything in the universe has to be our real point of reference. If we move toward another star then we move away from the Earth and toward the other star, they are both points of reference. As is everything else in existence as we must be moving in one direction or another relative to them. [/b]

It absolutely does stand up in the real world. It

*is* the real world. This is the very basis for time dilation, which has been measured precisely multiple times in the past and always has matched exactly Einstein's predictions. In fact, time dilation is used on almost a daily basis in particle physics. It enables scientists to observe properties of particles moving at high speeds that they would not have been able to observe if time dilation did not extend the life of these particles.

When you say point of reference, you are talking about a different thing than I am. I spoke of the reference frame. That is everything that is traveling with you, not the place you are coming from or going to.

<div class='quotetop'>QUOTE(\"thenumbersix\")</div>

c being constant is more to do with energy and mass conversions. Wasn't he saying that when converting mass to energy or vice versa that mass and energy can change but light can't ? You couldn't contain the energy from a nuclear detenation and change the speed of light locally (or could you)... [/b]

C is absolutely constant, a fact proven in the Michelson-Morley experiment that also showed that there exists no "ether". Special Relativity does not predict C to be a constant, it

*assumes* it. It is a postulate in Special Relativity that C is constant. Every prediction of Special Relativity is a result of this fact. Indeed, the entire theory can be deduced from C being constant. C will always be measured to be the same no matter which reference frame you are in, whether you are moving with the flashlight or whether you are standing still and the flashlight is moving past you.

<div class='quotetop'>QUOTE(\"thenumbersix\")</div>

Tenshi, if your craft reaches infinite mass, doesn't this include your fuel tank which will also gain infinite mass ! There's your infinte energy source.[/b]

Again, infinite fuel does not equal infinite thrust. As your mass approaches infinity, your engine's thrust (which is not subject to relativistic effects) still has to accelerate you. Your thrust is finite, your mass infinite, which one prevails? Can an ant make a moving car speed up by pushing on it?

Harte