Einstein taught us something very interesting. The speed of light is the same for everyone, at whatever speed you go.
While still light up a stack light to travel 300,000 km per second. But if they are on a hypothetical spaceship that does not exist, that goes to 100 thousand kilometers per second, and turn on the usual pile in the direction they go, what happens to light? 100 000 + 300 000? No. 300 000 is a barrier imposed by nature, insuperable. Then what happens? What happens is that for those who are into the space will be all set: the light projected against the front wall to the usual travel 300,000 km per second, but if you look at the phenomenon from outside, say from a "firm" will be the sum of the two speeds , one of the spaceship and the light of the battery, to go to 300,000 km per second. How is this possible? E 'possible "slowing down" the light inside the ship. And indeed this is what happens. Not being able to increase the speed of the light beam, all that is inside of the ship will be slowed to an outside observer. The faster the spaceship will appear slower and the movements that occur within it.
My friend Joseph had problems and said "if the time is zero, since the speed you want it?" And then, crying "V = S / T"
More or less the same thing that Einstein had discovered.
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