Twin paradox
https://www.pxfuel.com/en/free-photo-xnsas In 1905, Albert Einstein published his first paper on the theory of special relativity, which is based upon two postulates: 1 . The laws of physics are the same in all inertial frames of reference 2. The speed of light is invariant in any inertial frame of reference Inertial frames of reference can be considered ones which are ‘neither accelerating nor rotating with respect to the distant galaxies.’ [1] Two direct consequences of these postulates are time dilation and length contraction. Time dilation refers to the apparent slowing down of a clock, from the perspective of an observer who is in relative motion with it. The factor by which time is dilated is called the Lorentz factor, calculated using the following equation [2] : Similarly, lengths of moving objects are contracted, from the perspective of a stationary obs...