If you wish to travel from earth to the nearest star ‘Sirius’ at 99.99999999% of the speed of light, it will take you 18 hours to reach Sirius. However, when you return to earth after another 18 hours with an intention of dinner, you will find that your family and friends would have already had 6,570 dinners. The explanation lies in the concept of time dilation of the special theory of relativity.
Journey to a star
