Einstein's Relativity: Time Dilation

http://www.facebook.com/ScienceReason ... Albert Einstein's Theory of General Relativity (Chapter 2): Time Dilation - Slowing Down Clocks.

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EINSTEIN'S RELATIVITY:

Everything in the universe is traveling through space-time at the speed of light - the maximum speed possible. If you are sitting still in space, then you are traveling through time at the maximum speed. But if you begin traveling through space, then your progress through time slows down. Time Dilation and other relativistic phenomena await you in this interesting series, so hurry up and slow down!

1. Basics And Impact In Our Everyday Life
http://www.youtube.com/watch?v=j72bPmXsyvk&fmt=18
2. Time Dilation - Slowing Down Clocks
http://www.youtube.com/watch?v=HHRK6ojWdtU&fmt=18
3. The Famous Equation E=mc2
http://www.youtube.com/watch?v=7h7tyQlpda4&fmt=18
4. Gravity And Acceleration
http://www.youtube.com/watch?v=LHPqhTY6dh0&fmt=18
5. Black Holes, Event Horizon & Gravitational Waves
http://www.youtube.com/watch?v=iA53l7AG7Pg&fmt=18

SPACE:

Want to know why we don't have to worry about our sun burning out? It's because long before that happens, the sun will expand so enormously that Earth will be cooked to a cinder. Take a tour through the solar system, learn about the event horizon of black holes and when our galaxy began.

1. Faster Than The Speed Of Light (1/2): The Universe - Created Out Of Nothing?
http://www.youtube.com/watch?v=fxNbXjBbzEo&fmt=18
2. Faster Than The Speed Of Light (2/2): The Expanding Universe
http://www.youtube.com/watch?v=MoTNGmlOO2g&fmt=18

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[savingcrabsaround123]

great video



[Catnipy]

@ScotchTapeWorm But the perception is relative, one looks like it's moving relative to it self and so does the other one. No matter which point of view you are at the one that appears like it's moving is always going to appear slower relative to yourself.

[ScotchTapeWorm]

@Catnipy The part where I get caught up with is, that the moving clock has its light at an angle thus taking a longer time. The stationary clocks light is vertical thus being faster. If youre in the moving clock, the light will seem like it's vertical, and the stationary clock will look like it's moving. However, light is going the same speed no matter what, so to the moving clock, the stationary one should seem faster.

[LeconsdAnalyse]

RE: Your 1st. Question:

In 3+1, let inertial frame O` move with 3-velocity ξ = vÛ relative to inertial frame O. Where `Û` is a unit 3-vector in the direction of ξ, and `v` is the Euclidean norm of ξ (viz., v≡||ξ||).

The ending of the above clip is just saying that as far as SR is concerned, it is EQUIVALENT to view the above situation alternatively as O moving with 3-velocity ζ = -ξ relative to inertial frame O`. Since, ||ζ||=||-ξ||=||ξ||.

[LeconsdAnalyse]

2/2

The point about using light is that its speed is fixed and independent of the motion of its source, and given that the distance between the upper & lower mirrors of the `clock` is also fixed, a reproduceable unit of time is defined.