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# 1: The Special Theory of Relativity - Kinematics


• 1.1: Time Dilation
Time itself passes slower for an object is in motion.
• 1.2: Length Contraction
If the time interval between two events depends on the relative motion of the observer, Einstein realized that the spatial separation between the events must also be observer-dependent.
• 1.3: Lorentz Transformation
The Lorentz Transformation allows you to transform the spacetime coordinates of an event in one inertial reference system to any other inertial reference system.