Time Dilation - Albert Einstein and the Theory of Relativity

Video Title :	Time Dilation - Albert Einstein and the Theory of Relativity
Description :	Two spaceships are traveling together through the galaxy at close to the speed of light. Mounted on one ship is a laser that can fire pulses of light, and on the other, a mirror. The pilot of the first ship fires a pulse at the mirror, and watches as it is reflected back. A clock on board measures how long the round trip takes. But now suppose that he does this as the ships are passing an observer on a nearby asteroid. According to relativity theory, this observer sees the pulse moving through space at exactly the same speed that the pilot does -- namely, the speed of light. But he also sees the pulse traveling a longer distance, because from his perspective, he must add the forward motion of the ships to the motion of the pulse between them. So he measures a longer time interval for the round trip than the pilot does, because he is watching the pulse go farther without going any faster. This effect is called time dilation: if one observer is moving with respect to another, each perceives that the other's time is flowing more slowly. National Science Foundation
Views :	110162
Rating :	4.77
Keywords, Tags :	Science Physics Albert Einstein Theory of Relativity time dilation
Video Length :	1 : 22

Comments :

Actually, the stationary observer would see the light travel with the same speed only on the y axis. Horizontally, he would see the light move much faster, which makes the whole premise of this pointless.

correct. the velocity of the ships is added to the vertical velocity of the light, making the light (to the stationary observer) travel faster than the speed of light

True. But you know what relativists will say that the diagonal speed must be c. They did the same with their light clocks which are pure magic and no physics.

They have to say that because they don't transform their origins. That was a big mathematical blunder. It is like magically both the origins of the moving and stationary frame coincide. Einstein even explicitly stated that in 1905. x' has to be infinetisemally small so that the origins appr. coincide. Lorentz transformations didnot come into play in this manner anyway.

True. I only like to add that the stationary observer will seemingly see the speed of light faster because it seemingly travels more distance, in the same time period though.

Interesting news today: "Einstein Was Right, Astrophysicists Say" w w w . sciencedaily . com /releases/2008/07/080703140721 . htm

stationary observer? Stationary compared to what? "Horizontally, he would see the light move much faster" Nope. If that were true, then every star would send lightwaves with different speeds. Blueshifted light would travel faster than redshifted light. Supernova observations have disproved this. The speed of light in vacuum is ALWAYS c, regardless of the velocity of the source or the observer.

You are still confused between active and passive galilean transformations. And redshifted doesnot travel faster then blueshifted light. Maybe you are thinking too much on a ballistic theory.

Second of all this equation is still galilean invariant (s-s0)=c(t-t0).

The faster you go. The slower time is to you. If you want me to write out a whole example, just PM me and I will for you :).