Some Relativity Issues

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There are also physical laws which are characteristic of phenomenon and show the working of systems. These systems include harmonic oscillators, antenna, and the solar system and so on. In the solar system we are in, the earth will orbit the sun which is at the centre. But it is a body that travels in an ‘ellipse’ and that is a circle that has two focus points, which can circle round to have its shape. Light that is produced from one foci will be reflected from the inside edge of the ellipse at all points so that it will arrive at the other foci. The sun is situated at one foci and the earth will orbit it, however, what happens is that as the earth travels away from the sun, gravity takes a bigger and bigger hold, and just as you think it is about to fly away, the strength of gravity has pulled it back to the sun. And as it comes back closer to the sun there is less gravity, the earth slows down, and it swings round the sun.

Now, the sun is very interesting because all the time it is trying to explode but it is disabled from doing this because the force of gravity keeps it a sphere. And in general relativity there is the name ‘accelerated motion’ which is where there is no difference between the force of gravity and the feeling of moving in some direction at any speed. This means, for example, that rather than objects falling to the ground, what happens is the earth moves towards the objects. But that is happening on one side of the planet... what about on the other side? The same thing happens. In effect, and as a consequence of general relativity, it is like the earth is actually expanding and doing so at an incredible speed: the speed of light. This is E=mc squared. Mass is energy.

The same is true of time which is said to be the fourth dimension of spacetime and which some think you cannot as humans with small minds perceive as reality. However, I believe that glimpses of its nature are available through the thinking that lightspeed is a constant. By this I mean that no matter how fast you are travelling, if you measure the speed of light it is always the same: 298,000,000 metres per second. One thought experiment that was used by Einstein is this: what would happen if you could move at lightspeed next to a beam of light? What would you see? Einstein thought that the beam would still get away from you at lightspeed... this is because lightspeed is constant: never changing; invariant. It is one of the constants of nature. You inevitably must imagine what things would be like if suddenly lightspeed stopped being constant. If the light beam we were chasing appeared stationary (such as if you were in a car on the motorway and you looked over to the one next to you) then surely our surroundings would then freeze, we would freeze, and all time would appear to stop. Surely you would see this.

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