List Of Travel At Speed Of Light Time Slow Down Ideas. Web however, light *can* slow down slightly when it passes through an absorbing medium, like water (225,000 kilometers per second = 140,000 miles per second) or glass (200,000 kilometers per second. Web physicists slow speed of light.
The faster the observer moves the more light is spread out and time slows down. Web this case is sometimes called special relativistic time dilation. Web when you travel close to the speed of light, you experience less subjective time, according to the lorentz transform.