The Physics of Time Dilation at High Speeds

Time changes when traveling close to the speed of light due to the principles of relativity and time dilation. The speed of light is the same for every observer, and nothing can move faster. As one approaches the speed of light, time appears to slow down. This leads to the twin paradox, where one twin who travels in space on a high-speed rocket will return to Earth to find their twin has aged faster than they have. However, both twins experience time normally relative to themselves, and the paradox is resolved through the mathematics of relativity.