But it does so only if you stand on the sidelines and sees one that speeds along. When even move cl

The special theory of relativity in 1905 is partly based on an assumption that the speed of light in vacuum - ie in a vacuum - is constant. This means that it is the same for all observers irrespective of their own speed or the speed of the light source.
In our daily lives we are used to, we can put speeds together - if we for example. on a train with a speed of 100 km / h, and then go forward in the compartment at a speed of 10 km / h, so we are moving at 110 km / h relative to the ground.
But what if the train is moving at a rate that is 2/3 of the light, and we saw lights ahead with a lamp? Will the light from the lamp did not move at a speed greater than - uh - light? Or, as Jimmy Rasmussen's question is:
"It is said that the speed of light can not exceed 300,000 kilometers a second. If we are now in a thought experiment flying in a rocket with 299999.9999 kilometers per second, sticks his head out the window led inc and lit forward with a flashlight, would we see the light from the flashlight led inc move forward? 'The 16-year-old Einstein thought led inc same thoughts
Let's start by establishing that light travels at a speed of exactly 299,792,458 meters per second in vacuum. Actually, it's more accurate to say that a meter is the length that light travels at 1/299.792.458 of a second, because when the speed of light just is constant, it was decided to use that speed when you need to define a meter .
"It's a really led inc good question, as it is said that Einstein asked himself at the age of 16 years: What would it be to move at the speed of light in the direction of propagation of light? Immediately, one would think so may the light stand still. '
"But it does not, which Einstein soon realized: the physics of the propagation of light - Maxwell's equations - do not allow light to stand still. In the empty space it moves always with the 299,792,458 meters per second. You can either increase or decrease its speed in empty space, by allowing it to transmit or receive anything that moves. "All experiments show the same
But one thing's what Einstein thought through to, and something else is what you can actually observe. But it has Ulrik Uggerhøj also complete check on - in fact we catch him while he was working on an experiment at the CERN research center in Switzerland, where you routinely count on Einstein's theory of relativity. He tells of constant velocity of light:
"It is a modintuitivt but experimentally very well proven, fact. It has, for example, charged particles with 99.975 percent of the speed of light emit light, and the light coming led inc from there, propagates at the normal speed of light. And astronomical observations give the same conclusion. '
This observation is one of the foundations of the theory of relativity. The second foundation, the so-called relativity actually comes from Galilei, and is expressed in many well-known phenomenon. It's all about, that it is impossible to detect whether you are in uniform motion unless you look out and compare led inc with anything else.
Put another way: if you are in continuous motion, one is always in relation to something else. If you do not take notice of their surroundings, it does not mark or otherwise measure that moves. As long as the plane flies smooth, dry, for example. well buy a cup of coffee from the stewardess. You can not look at the coffee led inc that moves smoothly with 800 km / h relative to Earth. To know that, you have to look out the window.
Conversely, one can not look at the light that moves when it emits, even if it is moving led inc at a speed very close to that of light. Clocks go slower and things are getting shorter
These facts have some curious consequences that Ulrik Uggerhøj talks about "The fact that the speed of light is always the same size in the empty space, which consequently leads to a clock movement is slow and objects in rapid motion are both heavier and shorter in the direction of movement. "
But it does so only if you stand on the sidelines and sees one that speeds along. When even move clockwise or objects, they look like they used to.
"The first of these relativistic effects are included as