The timelessness of photons.

As an object approaches the speed of light, time experiences a relativistic effect where it ticks slower relative to stationary observers. This principle, established by Einstein, means that at speeds very close to the speed of light, aging and all biological processes slow down significantly. If it were possible to reach the speed of light, time would cease to pass altogether. Photons, which travel at the speed of light, do not experience the passage of time; any 'timepiece' carried by a photon would not tick. Consequently, a photon emitted from one point in the universe to another perceives its journey as instantaneous, as no time elapses during its travel, demonstrating a profound aspect of the relationship between speed, time, and existence.