T0 7 years. We refer to this effect of time as time dilation. The time will always be shortest as measured in its rest frame.
Its the standard time dilation formula and in this case should give a result of 1 but instead gives 0999949999.
T0 7 years. The rate of time thats perceived by an observer may change with respect to an object which approaches the speed of light. Imagine a light clock which consists of two mirrors and beam of light reflecting back and forth between the mirror. The time measured in the frame in which the clock is at rest is called the proper time.